Non determinism
Most irksome are needlessly animated elements, that require timers, that for some reason don't always work. So in an effort to be flashy, basic functionality is sacrificed.
Also maddening is when, if you can even find a control to turn said nonsense off, it doesn't actually turn the crap off, it just offers the possibility of turning the animation time down to zero. And of course, all these re-inventors have unit tested that possibility, right? Suuuuure ...
Biting the hand that feeds IT
