I've noticed much higher level of service in the US compared to Europe were tips are not expected as much
Might be true, but I don't think that's necessarily a good thing. If someone is forced to be excessively friendly/caring because he/she fears that otherwise he/she might not get enough pay, this is a toxic work culture in my opinion. Also (even though I don't have data on this) it might also create unfair advantages to certain people, for example I think it might be possible that people who are more attractive (especially in restaurants) get payed more. But for the last thing I am just guessing here.
Might be true, but I don't think that's necessarily a good thing. If someone is forced to be excessively friendly/caring because he/she fears that otherwise he/she might not get enough pay, this is a toxic work culture in my opinion. Also (even though I don't have data on this) it might also create unfair advantages to certain people, for example I think it might be possible that people who are more attractive (especially in restaurants) get payed more. But for the last thing I am just guessing here.