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Since the mute LED is a user-facing security feature, it is in fact a pretty serious bug if users can't rely on it to be correct. Witness the wide variety of incidents over the last year where people ended up in serious trouble because they thought they were muted but weren't.

I feel like of all the examples in the blog post, this was the one with by far the biggest potential for actual harm to people.

What gives you the impression the author doesn't also make things?

I know they do

But it just reminds me of this: https://youtu.be/2Z8pgV74_Hw?t=148

Not everyone feels it's their moral right to be as productive/effective as possible.

This could allow a malicious party to trick the user into thinking it's microphone is not recording while it actually is.

If this action can be performed using the hardware button it is likely that it can also be performed software-wise, it would be a nice addition for malicious software such as malware.