Exact same. Except apparently you can make cider with it too.

Well unless the are arriving on foot, weight won't really matter - I'm more talking the difference between a takeaway for one vs for two, double the cost but why double the tip?

Tipping in restaurants has the same point too, although there you could argue I guess that you are tipping on the whole experience, including to the chef/establishment too. But yeah flat rate tipping makes sense too, though its probably more dependent on how much of their service you use (ie flat rate per number of people/dishes/etc)

Curious as tipping delivery like this isn't a thing where I'm from - why not just tip a flat rate? What is the reason for giving less/more to the deliverer based off the price of the order? You're merely tipping for the travel and time, no?