I believe this has been discussed in brief before, but I have not seen this exact question. Is there a technical or conceptual reason ArcFollowCamera does not support attachControl? My expectation is that it is a FollowCamera that uses ArcRotateCamera positioning, and since both of those cameras support attachControl, this one should as well.
At the very least, I’d like to see the docs explain this camera a bit more; right now, it is only mentioned in passing.