Here in Australia we don't even need to tip in restaurants. You order your food, you pay the price, and you go home. Servers are nice because that's part of their job and they are being paid to do that.
Sometimes waiters get a little embarrassed about it and tell you to just put in a zero amount. Sometimes they even put in zero themselves before handing you the terminal.
Tipping does happen, but "suggestions" for a specific amount or percentage seems wrong. Then you might as well include it in the price, which is what we have been doing since 1969.
There's no reason the server's service should not be covered by a reasonable salary that doesn't depend on tips.