I would not go that far. Security changes. iOS integration with AirDrop and Messages. Laptop trackpad gestures. But note what I'm highlighting for the most par

I would not go that far. Security changes. iOS integration with AirDrop and Messages. Laptop trackpad gestures. But note what I'm highlighting for the most part: mobile features. They've added good stuff for laptops, and for interfacing with iOS devices. But for desktops, and laptops living on a desk? Not so much. If you're using a full keyboard and a mouse, sans trackpad, I can't think of a lot of real UI enhancements since 10.6. (Which makes total since, given they sell so, so many more laptops than desktops. But still. I get it.)