An example would be multiple gestures for the same widget, which can be confusing, like a checkbox, switch or slider, etc. that brings you into a sub menu when you long-press it. That's what you see in Android's configuration. You look for a setting, but then you have to google for it only to find out how to get to the menu that offers your option.

I think the main reason that smartphones still work is that that most people use them in a really reduced way. One could argue for feature hiding, which is a good thing. However hiding I think means "moving it out of the way" and not "make sure nobody finds it".

I am not saying that Android and iOS are bad, but more that there is room for improvement. It's good to see new projects doing things a bit different. I always found it weird when people complained about copying. I don't think that's bad, but right now there doesn't seem to be a lot of progress. I like how KDE at least tries to do things a bit different instead of copying without understanding why someone designed their UX a certain way. Not every design works for every project/product.

I've also heard a lot good about Windows Phones, even though this caused fewer apps that really integrated. It's great when Microsoft tries new stuff, like in Windows 8. Yeah, it didn't work out, but the UX designes that sometimes are called innovative don't seem to be on par with the amount of research going into other fields of the big OSs. It may also be due to the market settling, but there is still room for improvements, so I hope it's not stagnating. It would be great to see other players.

I know different styles make thins harder for people doing cross-platform applications. Sticking to status quo makes things easier, but it also leads to stagnation and it feels like KDE4 and Windows 8 made a lot of people scared of trying out new stuff.