Thanks for all of this great feedback - it's super helpful. We're taking a look at the audio point right now. For headset setup, here's what we recommend: headset and iPhone converter.
Bullet #3 is a fair point; thank you for sharing. We'll consider this and other ways to make this more clear for users.
Regarding screening the caller queue, we have some ideas on our roadmap to help with this.
Thanks so much for sharing! Really appreciate it.
These cheap $20 headphones have gotten me through a year and a half of zoom