In short i just jumped into the whole Mastodon blocking drama and am somewhat disappointed to see it as childish as reddit’s power mod drama. Accelerated by the fact that a Limit/Mute option exist just fine, i wonder why Block/Defederation is an option at all. It only moves power from the user to admins without anything in return. With just Mute, as far as i can tell, one still wouldn’t have to look on certain instances, but could interact/whitelist certain individuals and we’d get rid of the multi account requirement overnight. So why isn’t it that way?
Defederation is an absolutely necessary tool. There are instances out there you don’t want any part of, with CSAM etc. But with that said I think defederation should mostly be used for such things. Block lists (containing instances, users, hashtags) that users can subscribe to would be a better way to handle the rest, and instances could recommend and/or curate lists for their users and maybe activate them by default.
Instances defederating from another instance because that second instance hasn’t defederated from a third instance is a good way to ruin the future of the Fediverse I think. It’s just an immature and destructive behavior leading to fragmentation.