Personally, Tesla's support for phone connections doesn't even come into play because there's plenty of other technical and administrative reasons to avoid them.

Also, based on descriptions of AA I'm seeing in this thread, it sounds like I'd rather just continue hooking up my phone's audio to my car's sound system and mounting it on the dash than use AA.

GM's alternative solution doesn't interest me whatsoever and it wouldn't surprise me if it comes with a horrible UX as most companies that make something else but try to also make software suck at it and include other BS meant to make them money rather than improve the experience. It will add no value to me but I'm sure it will add to the cost.