I don't think we should be tipping at all, even for exceptional service. The job is the job, and the employer should be paying the full amount that job is worth. If the employee is doing it exceptionally well, going above and beyond, the employer should reward them with a raise, same as for salaried positions.
That's assuming the employer values that above-and-beyond-ness, of course. If not, they won't give that raise, and employees will eventually settle on a level of service that the employer is paying for. If that's good enough for the customers, that's fine. If not, that's an opportunity for a competitor to pay employees more so they'll serve customers better.
Customers should not be put in the awkward position of feeling like they should be augmenting people's wages, even if it's on top of an already-sufficient living wage. Wages paid is a negotiation between employer and employee. Customers should not be involved, beyond paying the listed or contracted/agreed-upon price.
Yes, I have also been thinking how a similar reward system would work without tipping. Just use a bonus system based on customer feedback. And the flow could be very similar to how it is with tipping.
I live in a country with near zero tipping culture.
For the most part I find the food gets to my table at some point but I'm rarely particularly happy with customer service. It's sometimes an awkward negotiation to get their attention or to ask something. The opposite was true in my time living in the US - soft skills, fast response, engagement are standard. And I've been on both sides of that in food service.
Now, the logic of what youre talking about makes perfect sense and I agree with that in principle. And yet there is something about dining that is somehow different. Escapes that definition.
There are also times I find that exchanging money is more honest. I want you to serve me, I'm paying you, I don't have to keep at the back of my mind a question whether I'm asking something beyond what your boss expects/pays you. I like that about the US - it's brutal but that's reality.
Don't get me wrong, I live in EU for a reason, but some things here are made unnecessarily complicated and oblique too.