This is a popular trope but I’d really want to see some supporting data. It’s notoriously hard to correct for only hearing from people who found something they don’t like, people assuming their experience is universally shared, and for people to tend to forget old problems.
Anecdotally, I think Big Sur is better than either Mojave or Catalina: in my experience, it solves a lot of the bugs I was trying to avoid by sticking with High Sierra.
