I don’t think instance admin should mute or block communities just because people don’t like that some content shows up on their ALL timeline.
Now, there is a case to be made about muting some content, but in general the all timeline is supposed to be wild and untamed.
I just block communities I don’t care about. It takes some time but eventually it will be a marginal amount of work to get to an All feed that doesn’t have a TON of stuff I don’t care about.