My least favorite feature of modern UIs: undiscoverable settings and options that only appear if you have enabled some other non-obvious option, are in some uns

My least favorite feature of modern UIs: undiscoverable settings and options that only appear if you have enabled some other non-obvious option, are in some unspecified state, or, more typically the star are aligned. My actually least favorite feature of modern UIs: doesn't matter if you actually learn to use it, because in two weeks it will change under you with on OTA update. And good luck finding documentation (third party of course) for the new redesign, because you are actually a guinea pig in an A/B test and most users do not have the same experience.