In the spirit of being encouraged to speak my mind here's a slight effort post:
Defederation does not do what you think it does.
The instance creator and admins are those with the ultimate power within their instance. The active users delegate them that power by interacting with their instance.
Defining "defederation" within the context of Lemmy as I understand it:
"the act of denying the ability for accounts within specific instances to interact with each other"
Anyone at this current time can create an account on most instances. One site on sh.itjust.works is defederated right now, but anyone here may also have an account there, who knows? The value comes from our activity and interaction within each instance.
Defederation is a narrow and a slippery slope because it doesn't actually solve any problems. There are many instances which are doing things I think should be banned. I don't interact with them. I don't provide them with any value.
We uphold an inclusive enjoyable community here by being active. Individuals with malicious intent are ostracized naturally by an active community. Defederating entire instances does not stop bad actors, but an active strongwilled community does.
It's not our responsibility to moderate other instances.
Is it possible to ban an instance from my user level? That is, can I prevent myself from seeing their posts and comments on this and other instances? If so, then Blocklists might be the way to go. Sign up for a "no Nazis" list or whatever.
This is the real answer I think. Users should be treated like adults who are capable of determining by themselves what content they are comfortable with seeing.
If I don't want to see an extremist political community on my feed, I block that community myself. If an instance is full of such communities, I block that instance myself.
I don't want or need some other random on the internet to make judgement calls on what content I can or cannot interact with.
Defederation is a tactical nuke, that if used incorrectly will destroy the freedom, decentralization and openness of Lemmy, and replace it with a far more centralized series of walled gardens.
I fear that people are trying to recreate the reddit model on Lemmy. Lemmy is not reddit, Lemmy is better than reddit. Reddit is top down, Lemmy is bottom up. We don't need more mod control, we need more user control.
I would love to see more features built for user moderation of content. Perhaps I could subscribe to another users blocklist, or follow their 'recommended communities'. Instances themselves could maintain suggested block lists, and users could chose to enable or disable them at their own discretion.
Honestly, I'm not sure that defederation has any place at all. Even things like spam and bot instances I think would be better handled by a blocklist (enabled by default even), that users can turn on or off as they see fit.
Yes, you can block users. Click the 3 dots on my comment and then hit that little 🚫 symbol, and boom, I'm blocked.
Why are you trying to view everything and ban things you don't like instead of viewing your subscriptions and only joining communities you do like?
I want to see what communities are out there and active. I'd rather not be stuck in a walled garden of my own making. My default sort is currently Local/Active, but I'm still playing with it.
I also want to see communities out there, but instances defederating makes it a whole hell of a lot harder because it kills visibility of those instances. I don't want to have to swap between a handful of accounts to just have basic functionality all because moralizing assholes want this to be like reddit