The cook in the kitchen gets no tip. Unlikely to be appreciated, gets no share of the tip, and could make my dish a delight, or spit in it.

The guy/girl says "i'm gonna be your waiter tonight", and that's the last time you see them, others bring the dishes and clean the table. And by law, they cannot share the tip.

When I pay for service, I'd like the employer and the market to figure out for me what's a fair wage. Don't put it on me, 1) I'll most likely be wrong and unfair, and 2) I just cannot tip the cook.