Possibly once a year I install Ubuntu on my laptop and am always determined to move over to Linux on the desktop but sadly it takes only a few days of frustration before I revert back to OSX.
It's nothing to do with 3D shadows under windows, the dock enlarging when I roll over it or my co-workers being impressed because I've got a Mac, because they all have Macs too.
That last point is the least of it - honestly, I have no desire to impress anyone with what technology I happen to use and find it quite extraordinary that anyone thinks owning a Mac is some kind of status symbol.
It's not as if Apple product ownership is a rare thing, people from all walks of life own Macbooks or iPhones or whatever, yet this falacy that Mac/iPhone owners buy these products to impress people still somehow persists.
No, it's the fundamental user experience on various desktop managers I've tried on Linux that while it clearly works for other people, it simply doesn't for me.
There's nothing wrong with that, and I'm sure if I persisted with it for longer then I'd perhaps be happy enough using Linux on the desktop but to be honest it's time I'm not that interested in investing, when I'm immediately productive on OSX, and was when I first started using OSX back in 2004.
My OSX experience is wholly different to yours - I get rare update notifications, possibly because of the software products I use? and performance on my 2018 MBP is as quick as I've ever experienced, but then it should be for a modern computer.
For me, OSX/macOS simply stays out of the way and lets me get on with doing work. I'm sure Linux does the same for you but be assured, the reason I use OSX is not a single one of those reasons you've suggested.