I skimmed through that page, and one thing stood out to me above everything else.
Simply bring iPhone close to your Mac and it automatically switches to iPhone as the camera input. And it works wirelessly, so there’s nothing to plug in.
By default? That seems like extremely undesirable behavior.
as I often have my iPhone directly underneath my iMac. Yes, I completely agree with you that feature is going to completely piss me off! 🤦♂️