Only up to a certain point, no? I remember it was something around 100k USD, maybe 10ish years ago.

This is pretty intuitive. Its nice not to have to worry about money, but what is the difference between having 1M NW and 100M? If you're a mentally normal person, it just more mental burden.

Really? Last I read the correlation breaks above a certain threshold, roughly that of "I don't need to worry about food or bills".