Teams... it's from Microsoft, nuff said. I use a docked laptop at work so I'm audio-only. Working from home the camera is covered unless it really needs to not be covered.You can leave them, but they're still there. You can't delete them like you can with a Skype conversation. Best you can do is "hide" them.
Yes the audio is fine, but no better than Skype. I refuse to use the video feature (have tape over my camera plus I keep the camera disabled on my computer). A handful of people use it on our team but if they move slightly to one side or another, they fade out, largely because they're using a fake background that seems to work like a "green screen" for weather people on tv. I don't need to see people to hear them.
My coworkers see me (my avatar) as this.
The pandemic and Teams have driven WAY too many Teams meetings. My bosses get hit by this, I avoid most.