Well I think the incentive these days doesn't have a lot of effect. Most of the wait staff expect a generous tip as a mandatory rule and are very angry if they don't get it even if their service was so so. It's not needed in some countries because expectations are that workers should always do a good job without having to be bribed. I'm NOT for stiffing the help, I just want the restaurant to pay them a fair wage like is the practice for other jobs and add it into the price. The tipping game is obsolete IMO.Better servers get bigger tips from me. The first summer of COVID my daughter waited tables at a bar grill near a state park that gets over 1.5 million visitors/year. She averaged over 30% on her tips. Her internship with the State Department that summer got cancelled because the candy asses in DC were all working from home. She got paid the server minimum wage in addition. Why the H would you want to disincentivize wait staff to hustle by fixing they’re wage?
And like all help in other jobs, in the event they don't do a decent job they should be fired.