That is true, but lines won't counter stupid people either. Sometimes that space that appears to be left is because a car left and a smaller car came. Sometimes it's because people are dumb and can't park.

Yes, sometimes without lines you get a strange half a space. Maybe a big truck left a spot and a mini Cooper parked there. There'd be extra space that's unusable.

Logistically without lines sometimes you lose space because cars vary in size. With lines you almost always lose space. It's the choice of always waste a little space or occasionally waste a bigger half space. They go with occasionally and no lines.

I'm certainly not trying to debate this. Just explaining the city's logic in why there isn't lines.