There is no system for tipping that makes sense. It's a bad social construct, just plain harmful from every angle. Let's abolish it.
"Lots of tipping systems make sense. It's a good social construct, and beneficial from every angle. Let's expand it."
Both formulations are just longwinded ways to say "I dislike tipping" or "I like tipping", without adding anything for people trying to form an opinion on the merits.
Tipping shifts the burden of paying staff from the employer who already derive most of the benefit from the staffs work to the patron who is pressured to pay a large bill than presented to make up for how shoddy the employer pays.
For the most effective and the most attractive wait staff especially white females in the most lucrative or the most inebriated environments they actually may make more than they would if paid a flat rate by their employers.
For the majority they are probably paid less. It's like a tax collected from black, ugly, or fat girls and given to 20 something females with nice boobs.
It replaces a negotiated predictable bargain struck after due consideration between adults with the whims of the odious masses who get to decide if their server gets paid based on whether she has sufficiently kissed their overly broad asses.
In some states they allow the servers to be paid less than minimum wage so long as they "tip out" which is to say they earned enough tips to ensure they earned between both sources the federal or state minimum.
Requesting the employer to make up the difference between tips and minimum even on a slow shift without enough business is a sure route to termination so staff are strongly encouraged to help their employers break the law and ultimately steal from them.
There are so many downsides and so few upsides and the upsides accrue nearly entirely to employers and a fraction of servers its hard to imagine anyone seriously arguing in favor of tipping.
Also from the back-of-house staff, who are rarely tipped fairly and often not at all, despite arguably having an equal or greater role in providing a good experience at a restaurant.
While we are at it, are you saying there should not be jobs where pretty people make more than ugly people?
Raise the minimum wage, disallow paying tipped employees less than the minimum and legally require all staff to share a tip pool.
Slightly higher prices will pay for higher wages and smart money will in any modest market advertise higher prices and no tips required simultaneously.
Now, if you are born having high aptitudes for programming it is ok to make more money? If you are born pretty is not ok to make more money in some jobs?
Having lived in the US for closing in on two years, the tipping system and sales tax/fees being tacked on at checkout is one of my bigger pet-peeves. This would be illegal in other places as that's highly deceptive marketing.
Really ... in what other circumstance would you ever reward an "extraordinary" accomplishment with a mere 15-20% bonus. What extraordinary thing costs just 15% more than the regular, run of the mill normal thing.