Hidden interface controls that affect usability

Only tangentially related, and a seemingly lost old-man battle: stop hiding my scrollbar.

Interesting article. Some points I didn't quite agree entirely with. There's a cost and practically limitation to some things (like a physical knob in a car for zooming in and out on a map - although that was probably just an example of intuitive use).

I just recently switched a toggle on a newly installed app that did the opposite of what it was labelled - I thought the label represented the current state, but it represented the state it would switch to if toggled. It became obvious once changed, but that seems the least helpful execution.

Right! If you want it to denote an action, you need to include the verb: "TURN ON" would be entirely clear. It's even clear if you sometimes DO want to show state / not a button "IS ON" is also perfectly clear. There's only a few that might he confused when the verb is shown, like "INCREASE," although I would have to work a little to imagine the UI where it's not clear whether the button is showing the verb or noun.

One of my big beefs with modern UI is two-state controls where it's impossible to determine what the current state actually is. Like a button that says "Music Off" where it's unclear if that means the music is CURRENTLY off, or if clicking the button turns it off.