I don't think people should be pressured or required to tip, but I still do, since I know restaurant workers still don't get paid what they should. At least at most places, staff relies on tips as more than just “bonus” pay.
I occasionally see notes on the bill or menu like “we pay our staff a living wage, so there's no pressure to tip.” But more often I see “suggested” tip amounts from 20-25% or it's already been added to the bill.
Discuss.
[Edit] Sorry – should have said: 'Murican Tipping Culture.