Tipping is out of control now in the US. I've started paying cash for a lot of things now in rebellion. If you pay by credit card the server flips a tablet to you with 3 choices....20% tip, 25% tip, or 30 % tip. This for counter service of 1 drink. I'm not going to be pressured into tipping.
The Seabourn website says tipping is neither required nor expected. I'm following Seabourn rules.