> guaranteed

I used to design airplane parts and systems. A guarantee isn't worth squat. Being able to positively verify it is what works.

You're right that I don't use a laptop for videoconferencing. I wouldn't use the builtin mike and camera anyway, as a 5 cent microphone can make it hard for the other party to understand you. I use a semi pro mike. If you're in business, I recommend such a setup.

I meant "guaranteed" in the sense of "ensured by design", not in the sense of somebody making a promise. Besides that:

> Being able to positively verify it is what works.

How do you positively verify that a device only contains the microphones you're aware of?