The new versions of macOs provide no added advantage and have a lot of regressions. I used to use Exposé all the time, now I don't because everything slows to a crawl when I activate it.
And I run into severe bugs. For example, when I installed Yosemite and activated Filevault, it managed to corrupt my partition and all my data (luckily I had a backup).
I really wish Apple starts actually hiring good software engineers or at least manage them to work on their OS because right now it's embarrassing. It reminds me of when Windows ME was a thing. If Apple ran the I'm a Mac, I'm a PC ad nowadays they wouldn't have much of a leg to stand on.
And then don't even get me started on their pro apps. Aperture used to be a great app (much better than lightroom), they stopped its development.