Would it switch the lights if you’re only listening with headphones while your camera is open?
Most of my awkward moments happened with family members casually cruising on my background while someone else had the word. Usually they can hear when I’m speaking and don’t enter the room.
In all my meeting software (the usual suspects running in the browser) the mic is always opened at the driver level, even if I'm muted. Perhaps it's to avoid latency when you unmute, or perhaps it's for those "you're muted" pop-ups.