S for Snow Leopard, yes. A solid version of MacOS...followed right along with Leopard.
Now...the nonsense of making MacOS more iOS-ey....yea, not fond of flat icons and iOS on my desktop....it really should have been the other way around. I'd give all that up if I could boot directly to OPENSTEP on modern hardware [without an emulator].
But the true exclamation point on this...the foundations of macOS [today] still are sitting on things NeXT/OPENSTEP. A testament to 1990's technology, that's still relevant.
EDITED:
After posting, I wanted to add some context to the line "the nonsense of making MacOS more iOS-ey"...and note...personal opinions follow...
Yes, it should have been the other way around. One of my biggest gripes about iOS is the inability to get to a file system. Jailbreaking a device to get to that, is just ludicrous! If I want to add a sound, go to iTunes [in the past] or having to use the Finder to connect to an iOS device, hope that it gets discovered on a WiFi network or have to find a cable, copy the sound over...blah blah blah. Why couldn't there be a file system [that we can get to], connect to a server and put the file where you want?
Wanting direct access to the file system and having more than just what someone wants [or really declares to be] 'experience' would be great on both iPhone and iPad. There was mention of us being in a post-PC era...I don't see that. I'd give up my iPad today to keep my Mac...or any other computer for that matter. Using an iPad as a true production 'machine'...nope. For those that do it, much credit due.
watchOS and tvOS are different beasts, so asking for macOS features there isn't part of this little rant...just focusing on iOS. 😁