I've always viewed tips as a way to let customers decide the merit pay for employees. Does NL have the uber star rating tied to tips? It was a way to make the star rating meaningful. It used to be everyone gave five unless it was terrible service, so uber made you put money where your rating was.
Edit: I remember the public transit being quite good so maybe NL doesn't have uber? I also remember waiters not being very easy to find to ask for anything.
There's Uber, but indeed, I am satisfied with public transport and have never used the likes of Uber.
It's not that I never tip at a restaurant (however, seldomly in NL), it's just that in the US you'll get bills with a percentage already 'included', and it 'is understood' that you must tip _something_, in a way (to me) very similar to bribes elsewhere.
Percentage included only happens for large parties (8 or more). Normally you don’t have to tip. It is entirely voluntary (though strongly encouraged since it is helping the poorest members of society). Think of it like a voluntary socialist tax to help the poor.
Edit: I remember the public transit being quite good so maybe NL doesn't have uber? I also remember waiters not being very easy to find to ask for anything.