I understand your point, it may seem unfair that 5 accounts with many followers create a small group that massively impact your reach. But the group in question is “people following the ones who don’t want to listen to you”. What do you think would happen if this feature did not exist, people magically tolerating your opinion? Mute list, as a system, existed long ago before nostr, and for one simple reason. There are not a nostr dev decision, but a needed social protocol.