Maybe, maybe not. It depend on the situation and the people. At the end of the day, people don't need to justify their reason to not be friend with someone. They don't need a good reason outside of I don't want to be friend anymore. Without specific I can only answer vaguely.

Like someone else said, legal doesn't mean moral. On top that of, people will judge other people even if they don't know all the facts. We as human will rarely do an exhaustive research on everything before forming our opinion. The vast majority of time we base on opinion on incomplete or false information. And finally, people can still think you have bad intention even if what you did what ''right''.

By parallel, I assume you mean on the same plane. You are kind of right, on diagrams they are exactly on the same plane because well you are looking at a 2D representation. In reality, they are not exactly on the same plane. That said, there are pretty close to it, compared to the Sun's equator, Mercury is only at 3 degrees of inclination, same with Venus, the Earth is at 7 degrees, Mars and Saturn at 5, Jupiter, Uranus and Neptune at 6. So they are all pretty close to be perfectly on the same plane. Why?

Well first of all the solar system started as a big cloud of particles. All of them were moving around in random direction. You know a figure skating spins? Well it show phenomenon, if you spin and you bring back your limb toward the center of your body, you will spin faster. Same thing happened to the solar system. As gravity brought the cloud of particle together, it started to spin faster.

Particles started to hit each other, which created a favored direction of spin. Aka most stuff was spinning in one direction, so everything else go bumped into, leaving just one main direction of spinning. You can see that happening in this demonstration video at around 2:30min.

Now you have a ball of particle spinning in one direction. The second analogy I will use is when you are spinning a pizza dough. I won't go into the physics detail of why this is happening, but basically the fact that the dough is spinning will stretch it around the axis of rotation. Same happened with the cloud of particles that was our early solar system. It stretch around the axis of rotation, bringing all the particles into roughly the same plane where all the particles eventually came together with gravity into the different planets.

Low Carbon Steel or Mild Steel. It have between 0.05 and 0.25% of carbon. It have lower strength than other form of steel, but it's also more ductile which mean it's easier to machine or work with. This make that steel ideal for structure like building, bridge, etc. Because even if they have a lower strength, they are easy to shape into different shapes. The fact that it's ductile make is also safer in building, basically the building will bend which give notice that something is weird and it won't just collapse on the people right away.

High Carbon Steel have between 0.61 and 1.5% carbon. This type of steel is very strong, very hard and harder to machine or form into shape. This make it ideal for item that will have to endure a lot of wear like tools.

Medium Carbon Steel have between 0.26 and 0.6% carbon. It's an happy medium between lower and high carbon steel. Things like gears, bolts, automotive components, etc are usually made of that steel. They are parts that will suffer some regular wear so mild steel would be too damage, but it doesn't suffer enough wear to justify the higher cost and difficulty of working with high carbon steel.

Cast Iron have between 1.7 and 3% carbon. It's much harder than Steel, but also very brittle. Mild Steel usually around 130HB of hardness, medium carbon steel is around 200HB, but cast iron is closer to 400HB.

Stainless Steel have a high content of chromium (between 10 and 30% depending the type), but it can have different level of carbon up to 1.2%. That said, just like normal steel, the most used type of stainless steel will have lower amount of carbon than that.

Alloy steel well those can be anything, different type of metal added to the steel (usually in small percentage) will have different effect. Molybdenum increase the toughness so some cutting tools, turbine blade, rocket motors' parts, etc. Tungsten increase the melting point. Boron increase the hardness. Bismuth make it easier to machine. And many more.

Wrought Iron have a very low carbon, less than 0.08%. As you can see from 0.05-0.08% it could be both wrought iron or low carbon steel. That's because wrought iron isn't define by the carbon content, but by how it was produced. See in the past we were not able to measure the amount of carbon, so we didn't categorized iron by their content like we do today, but rather by the way we produced it. Wrought Iron (low carbon) was made from iron ore in a bloomery, but it take a long time. Pig Iron (high carbon) was produce by using a blast furnace and it was faster to produce than Wrought Iron. What you could do after is take your molten pig iron and add stuff like coke, limestone, you can also burn the impurity and you end up with cast iron. Or you can take your pig iron into a finery forge or puddling furnace to make wrought iron, this was faster than the earlier bloomery. Other things we used to do was beat the hell out of cast iron to slowly remove the carbon out of it or mix cast iron with wrought iron to reach a better level of carbon. Both medium were relatively expensive at the time.

It's only later when we develop steel metallurgy that steel took over the traditional iron, and now we categorize steel by their content, rather than the method of production. But now since both way of categorizing exist, it can be a bit confusing.

>nobody is getting accords for power/speed

True, but speed isn't the only reason to have more power. There is safety measure, but also luxuries. I like my divertissement screen, the GPS, the collision detection, the heating seat, etc. All of this mean more not only more weight to carry around, but also more electricity that come from the engine.

I also like to have a responsive car and a smooth acceleration, and for that you need more power. You don't really need to put the engine to the max to reach illegal speed on the road, but a more powerful engine change drastically how driving the car at low speed feel.

>I want that more efficient engine in lighter weight body to maximize efficiency

And there is other models that do just that. That said, those models are a lot less popular in North American compared to Europe so there isn't as much model available. Manufacturers sell what the market want.

They are more efficient, you are just missing some variable. The 2003 Accord curb weight was 2989lbs while the 2023 is 3239lbs. The 2003 Accord horsepower was 160 while the 2023 Accord have an horsepower of 192.

So the 2023 20% more powerful, weight 8% more, but is 11% more fuel efficient than the 2003 Accord. So the 2023 engine is much more efficient than just 11% since it have more power and it need to power a bigger car. If the 2023 Accord would have the same weight and power as the 2003, the engine might be like 20-30% more efficient (I don't know the exact number just a guesstimate)

Internal Combustion Engine by their nature is pretty inefficient. You can explosion happen to push piston, so obviously a LOT of energy will be lost in heat. There is just no way to get around that. We are getting better, but the ICE is a very mature technology, improving the efficiency is harder and harder to do.