I have, in the UK. Probably 95% of customers didn't tip. I didn't have any problems with this.
Why?
I was nice to people because that was my job, but when I've travelled to the US I have definitely seen entitled customers treat staff like shit and claiming it's their right because they were tipping.
Tipping as standard should go out the window, it just drives customers to be assholes.
I worked in a fast food restaurant here in the States, people tipped but usually not well. I wasn't pressed about it, I was getting a full minimum wage. Entitled customers didn't give me trouble for whatever reason, they seemed to size up my coworkers as softer targets.
> Why?
I was just curious about how OP's experience informed their perspective.