“Why aren’t you able to dial in with just your computer?”

“Oh, you know, I’m a bit paranoid about my microphone being hacked so I disconnected the microphone internally. If you give me 10 minutes, I can put it back together real quick”

Not the vibe I personally wanna be giving friends and colleagues.

Some people use headsets to cancel environmental noise, improving the listening experience of friends and colleagues.

If you are too weak to admit this is important to you, just go the "it's broken" route.

Indeed, many audio/video calls are preceded by text communication.