In these days, when a UI proclaims "simple", I just automatically assume that the vast majority of the important features are going to be hidden behind submenus or buried in configuration windows or otherwise have to be hunted for instead of cleanly presented to the user, because it was "simpler" for the developer to do it that way. And so-called "clean" UIs are actually "simple" in that regard.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor