That's why UI elements should almost never appear and disappear. There's a reason that GREYING OUT disabled controls has always been a fundamental concept of GU

That's why UI elements should almost never appear and disappear. There's a reason that GREYING OUT disabled controls has always been a fundamental concept of GUI design. It shows users that the function exists, where it exists, and that it's conditional. Peek-a-boo UI is incompetent. It's even dumber when you consider that, in most cases, the space for the disappearing controls has already been reserved; so nothing is gained by hiding them. And almost as bad as peek-a-boo UI is "flat" UI, where most controls aren't demarcated as such. So you're reduced to clicking on plain text labels and other inert-looking components to see if there are hidden goodies associated with them. Absurd. This is age-related only in that that it's about visual cues, which are the entire point of GUIs to begin with. Physical buttons on a device are inherently discoverable, as were the controls in GUIs for decades. Younger people are used to the incompetence of newer designs, and more tolerant of having to click every pixel on the screen to find things. It's unfortunate. The bright spot is that there has been some backlash against the "flat" laziness and a return to some visual cues.