Users on those instances who want to listen to you are free to go to instances that don't defederate you.
So. With Mastodon instance admins and this kind of drama, making internal strife about politics, gender equality, whatever, between a few persons affect thousands of users and greatly inconvenience them, and running a personal Mastodon instance taking great technical know-how and basically being a bit of a geek, I still consider these major issues with Mastodon as it stands today.
So, yes, I want to "enforce" people to hear me. If they choose to follow me. Because this means all the above problems are solved. The only problem federation solves today seems to be the scaling problem. Everything else is about friction and this kind of trouble and persistent worry. "Which instance do I pick" where it feels like you want to have an interview over a beer with the admin first. This has thus far been the major demotivator from what I've seen as a Mastodon user. I think I'd like it more like a P2P-based social network.