Any efficiencies you are seeing will be refactored and stretched out as any business cannot afford to carry fat if they want maximum profit and competitive edge (price).
This whole inconvenience of a friend going to the bathroom is an incredibly weak argument for foregoing the tradition and ceremony of interacting with a person who will provide you with a meal. If you want to live in a McWorld where every step of your dining experience is as sterile, efficient, and touch free as possible then I am sad for you. That's not what a meal with friends and family means to me, it's not just about eating for sustenance.
Why do you draw the line at taking payment?
The reason they get tips is because they are waitstaff, it has zero to do with how hard they work, it's simply custom to tip waitstaff, even lazy waitstaff.
Most employees work just as hard without getting tips (like the people who are actually cooking the food).
This is changing since now people are refusing to work those jobs. And yes, the entire industry is dumb and corrupt for having this practice in the first place, but it is what it is.
general minimum wage is peanuts, yes. but tipped waitstaff only make $2.83/hr is not true. If the employer did not make up the difference then they risk being fined/shutdown.
True, tipped minimum is $2.13/hr.
> If the employer did not make up the difference then they risk being fined/shutdown.
Employers make up reported shortfalls in tipped jobs, but they also often treat shortfalls as a negative performance indicator, justifying termination. In jobs where there are cash tips (not everything through a payment system), this incentivizes enployees to assure that there are no shortfalls.