That simply doesn't work for me. Regardless of what options I set, about 60% of the time, if I'm talking on an iphone with airpod pros, and I walk within a few feet of my mac (which does have a connection to the airpods), it will switch from the phone while I'm talking and... there's no reliable way to get that back. In the phone app, clicking 'airpods'... is slow as molasses and sometimes shows them as connected again, but... no sound. Speaker works - the call is still ongoing. If I walk far enough away, sometimes it will reconnect, but not usually. The only near reliable way is to disconnect the airpods in the bluetooth menu, then wait, then reconnect. This is annoying as hell for the person on the call to have to sit through.

Yeah, sorry Apple support... I've only got the ios 15.x from a couple weeks ago. No doubt upgrading to the very latest will definitely solve all extant problems, everything will magically 'just work' and there will be absolutely no new problems introduced. /s

When I describe this to some Apple store folks (2x last fall), they seemed 'shocked' (couldn't tell if it was fake or not). "Wow, never heard of that - no one's ever told me that before, that doesn't seem right. We have some training classes next week you can sign up for".