There are a number of ways to get this wrong. The shuffle button in Spotify on our Tesla is a grey color, and you have to wonder if it's dark ENOUGH a grey to indicate that it's on, or a light grey to indicate that it's off. So then you go to toggle it on and off to see the state change, but actually it's buggy so it doesn't do anything.
When you finally get it to toggle on, you realize the shuffle lines turn GREEN, not dark grey like most of the controls. facepalm
Also, the problem with buttons like this is that the shade of grey depends on the angle you're looking at the screen, so you end up moving your head around trying to figure out if it is actually on or off.
Worse yet, Spotify abruptly added a third option, Smart Shuffle, to their shuffle sometime in the past year or so. So now you gotta hit the button twice to go from shuffle to no shuffle, and once to go no shuffle to shuffle. This is for their mobile and desktop apps I mean. They gotta have some of the worst UX of newer consumer tech companies.
When you finally get it to toggle on, you realize the shuffle lines turn GREEN, not dark grey like most of the controls. facepalm