White/black "indicators" of toggles are horrid. A lot of phone and meeting apps do this and it's horrible.
As for mute, I think it's pretty objective at this point that an icon based toggle should show the current state, not the state that tapping on the icon will produce. That's because the icon is serving two jobs: Convey the state and let the user change it. When a developer gets this wrong and shows a crossed out speaker while audio is playing, that's just frustrating.
As for mute, I think it's pretty objective at this point that an icon based toggle should show the current state, not the state that tapping on the icon will produce. That's because the icon is serving two jobs: Convey the state and let the user change it. When a developer gets this wrong and shows a crossed out speaker while audio is playing, that's just frustrating.