Poor service earns 10%, but only if I intend to ever return to that restaurant. The worst tip I ever left was $0.02, and that number was chosen to distinguish it from someone who just doesn't tip.
I have never even seen service good enough to merit 25%.
I think it's perfectly fine to tip 10% for median service, so long as you tip more for good service and less for bad. Giving "everything is awesome" tips to everyone, all the time, is the tipping equivalent of "everyone gets a trophy" competitive sports. You're not really helping the people you're giving them to, because you're eliminating critical feedback signals.
that was my point.
I would rather tip 20% than use mental bandwidth for that nonsense.
If you don't change what you tip in response to perceived service quality, there is less incentive to make an effort to provide good service. You're engaging in renegade behavior, just like anti-vaxxers relying on the herd immunity to protect themselves from their own decisions. As long as anybody has to play this stupid tipping game, everybody has to play it.
If you really don't want to worry about it, why don't you just refrain from tipping altogether? It's table service. The restaurant should be the one enforcing its quality standards, and not the customers, right?