I've had every version of OSX and honestly the only thing I have against BigSur that came on my M1 Air is some of the Application icons. Not a big deal as I expect someone to resurrect CandyBar or some other theming app. I'm leaving Catalina, the previously most-hated (LOL) OS version not because I dislike BigSur, but rather there's no reason to upgrade a system Im not actively using.