In other words, you can know that the function to perform some task exists*, or you can know where to find the control that should make it work** -- but knowing either one will cause the other to fail.
Really, Quantum is the reason I hate "modern" UI -- the spatial UI makes sense with human psychology; this contextual stuff means that we change the function of the software just by observing it, and that means we can never memorize it all and just move on.
Which is why the UI design should be more straightforward. Contextual order in UI is more troublesome and more difficult to learn, hence trying to avoid nesting menus beyond two layers. In the literal sense there's nothing quantum in a UI and when we're talking Windows, nothing transforming to come close to it. I can only hope that the folks who have brought Start Menu sanity to 8/8.1 produce something that we're used to at least however I could also assume that MSFT has gone out of their way to prevent it. So either I'll have a reasonable Start Menu or I won't but just starting at the screen figuring out where/what to click seems inevitable.