There's a pretty interesting (to me) aspect of the mic indicator/controller problem: without direct visual feedback, you can't tell what mode your mic is in until _other people_ respond, or don't. It's a very laggy tool in terms of feedback even when it's "on". In fact, you often need to test it two or three times to be sure, because your fellow meeting members might have frozen, might just be thinking before they respond, etc

It's quite different from, say, dark mode, which is pretty obvious when toggled on/off.

So the feature benefits a lot from a visual indicator of current state regardless what you choose to do for the button. It's unsurprising people try to smudge the "state" and "control" together, for the mic more than many other controls.