I've seen a lot of people saying that tipping is uncommon outside the US, and that it's only a thing there because of the wage structure for servers. But that'

I've seen a lot of people saying that tipping is uncommon outside the US, and that it's only a thing there because of the wage structure for servers. But that's never been my experience. Over here in the UK, I almost always leave a tip when eating in a restaurant, as well as when getting food delivered or having a haircut. None of these folks are paid under minimum wage or rely on the tips to survive, they're just offered as a bonus for their service. And most others I know act the same way. They'll tip those who provide good service almost regardless of the kind of job that's involved. So is that uncommon or something? Are there really folks here who just... pay exactly what a restaurant charges and no more? Or am I missing something with these whole 'no one tips outside of America' discussions?