False.This is not a "claim". You people need to understand the difference between reality and unreality. There are no versions of reality. You try to mask unreality as opinion and I'm just not buying it.
Parallels is an extremely hacked together program that breaks very easily. This is well known, and not subject to debate here. Every macOS update has a negative impact on the current version of Parallels and never works as well as it did on the previous version. The multitude of examples of "how" are something only users of the actual program would know and understand, because the subtleties of it are vast and impossible to just list.
Heavily degraded performance and numerous bugs does not equal "works fine". Although I know it does for some people who just have to argue that things are fine.
There are lots of other things that break upon new versions. Also it can be looked at from the other angle, maybe it's the MacOS that breaks instead.