We don't have to go back to skeuomorphism of the old iphones, but whenever I use my phone I have no idea what's tappable and what's not. There's even this trend now of not making it obvious what's even a text box or what's not. It /looks/ nice, but it's infuriating to use. And then you have the weird gestures that are completely undiscoverable. Like pulling down from the top right to get the utility menu thing. I mean, yeah, I know it's there, but I never would have actually discovered that on my own. Also now there's this trend of just hiding everything to make an app look minimalistic and simple even though it's not. So I have no idea what it can even do when I look at it. And I /still/ have no idea how to properly line up apps side by side on my iPad. I mean I kind of do, but I constantly forget, and worse, once I do have them lined up, it's hard to get rid of them. It's all insanely undiscoverable.
I wish UX designers would realize it's not all about being pretty, you have to actually give people an idea of what things actually DO. All the clunky old interfaces with the bevelled buttons and huge scroll bars and stuff might have been ugly as sin, but at least they weren't a constant confusion.