I believe the limitation stems from the fact that Google Family uses the same underlying mechanism in Android as Mobile Device Management that's part of Workspa

I believe the limitation stems from the fact that Google Family uses the same underlying mechanism in Android as Mobile Device Management that's part of Workspace. I once managed to create an account that was simultaneously in Google Family AND in Google Workspace, but the end effect were constant notifications in Android that the account has joined Family, then deleted from Family, this several times a minute.