We try to keep distractions down to a minimum and maintain focus on the meeting content. As such, we have a policy of not allowing background replacement, because participants go wild with that feature. Mostly, they cooperate, but some times not. So if that feature were a host-selected global setting, we could disable it for all participants.
This will especially apply to the new (and frankly, ridiculous) “special effects” feature where participants can pin on facial hair and makeup. Global host disable for that one, please! ASAP!