I really hate the yearly update schedule. I looked at the list of new features in Big Sur. Improving security matters to me. And supporting the M1 is obviously important. The rest I don't even notice. I could wait two or three years for better sticky notes or whatever.Snow Leopard was also pretty good!
From subsequent releases (since Apple switched to the yearly update cycle) I've found Mountain Lion, El Capitan and Mojave to be the most stable.
To be honest, the UI improvements are often a step backwards, and they're inconvenient to learn. There are some areas where improvement would be great, like the way the cursor "hits" the edges and corners of windows isn't very good. But most of what I do with my Mac is use my application software. And I don't like paying my application developers to keep updating and testing their software to work with new UI changes instead of developing better features and more application stability.
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