I'm not saying that we've seen the last word in mobile operating systems, but neither iOS nor Android have made any fundamental UX changes in the last few major updates.
If "last few major updates" means, say, at least 2 major updates, I believe you've been hiding under a "few major rocks", because that's certainly not the case. Both platforms have seen tremendous UX changes/improvements.
Like what? Yes there have been some enhancements but the fundamental UI vocabulary and representation is the same. iOS was a big leap forward from the alternatives in 2007. Nothing we've seen since has been even close to as radical.
I find it really fundamental to swipe left and right to change the foregrounded app, and have the other apps still there where I left them when I swipe back. That's a huge huge change, and takes it from toy to tool.
Agree that notifications pull down and similar are gravy, but tasty gravy nonetheless.
I can't agree with that. Many felt that way in 2006 and definitely turned out not to be the case.