Pretty sure you're talking about something else. KDE is famous for being the most configurable desktop within at least 4.24 light years, probably much more.
It’s configurable yes, but it has plenty of quirks and bits of design that can’t be changed without getting one’s hands dirty and forking. Those are what people will likely find disagreeable, more than anything that can be changed.
For some, I'm sure this true but it's never quite worked for me. It's opinionated, which is fine but that means it isn't going to work for everybody.