I mean... if you mean a user making that choice for everyone else on their instance, then no - boooo, I wouldn't want that. If you don't want ~~an abortion~~ a defederation, then don't get one, simple as that.

But if you mean being able to block every single user from an entire instance, a true "instance block" rather than a mere "communities mute", then yeah, that's legit what I meant. Personally, I blocked all users from lemmy.ml that way. Though by far the more major effect was probably my piefed.social instance having defederated from hexbear.net, whereas my prior one at discuss.online had not.