Ideally, the restaurant should pay enough that tipping is not required (which does require them to raise prices). As a customer you would then be free to tip a smaller amount if you thought that the service was exceptional.
That’s how it works in the UK although a lot of businesses are adding a tip onto the bill in advance so that you would need to complain about the service to get it removed (technically you can just ask them to remove the tip without giving a reason if that’s how you want to play it).
Ideally, the restaurant should pay enough that tipping is not required (which does require them to raise prices). As a customer you would then be free to tip a smaller amount if you thought that the service was exceptional.
That’s how it works in the UK although a lot of businesses are adding a tip onto the bill in advance so that you would need to complain about the service to get it removed (technically you can just ask them to remove the tip without giving a reason if that’s how you want to play it).