(...) Windows 8 was equally stable and they tried a new UI which some liked and others said no much like Big Sur. (...)
The comparison with Big Sur is unfair.
Big Sur is, despite what people says and what Apple claims, a continuity to previous macOS versions. Yes, icons adopt a new style, yes, everything is rounder, yes the interface is less "metallic" with all that white, and yes, some menus and bars are "smoother". But overall it's the same OS, it's the same UI, it's the same menu bar, the same dock and the same user experience.
Windows 8 is the opposite of that. Microsoft radically changed the look & feel of a solid and stable Windows experience (from W95 to 7, nobody felt lost using them). The removal of the Start menu and the big full screen colourful tiles was a totally different experience from what people were used to. Plus the background colours, the full black interface, the stripped down icons to the minimum, the redundant settings under new menus and the good old Control Panel... everything looked different.
But, yeah, I understand that there are Mac users that dislike Big Sur changes and already feel nostalgia over older versions.
Unless... (I'm just wondering that now, after writing my post) you just referred Big Sur to compare the controversial changes. "some liked and others no much". If that's the case, ups, sorry, my mistake
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