I dunno, it’s just from noblesse oblige. If you don’t want to be generous to the people feeding you, then don’t tip.
And no, servers do a lot lot more. Have you actually worked any of these jobs? I did both.
There's a reason it's so damn cold in a lot of restaurants, serving is really hard work.
Kitchen work is kinda fun, serving is not, but you can make good money if you're good, due to tips.
The restaurants being cold is news to me, majority of the places I’m familiar with felt like room temperature, except for drafts when the door is opened.
Oh, nevermind, it's the restaurant world, where owners figured out how to blame someone else other than themselves for slaver-level pay.