This is despite the unfortunate and rude trend of payment devices now offering a big dickover screen filled with obscene tip suggestions first (25% in a fucking chain fastfood place?), because with the decline of cash the old way of rounding up the bill dies out too.

This. Now you withdraw money at an ATM and it offers you to give a 25% tip.

People who are not used to tips (i.e. foreigners visiting the US) don't necessarily know when they should and when they shouldn't give a tip. When in doubt, should they or should they not tip 20%? The whole concept is just very weird.

There's always the zero button and I always mash it happily.