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They may not have real federation, but they do some things well
(i.imgflip.com)
Memes about the Fediverse
Bluesky/twitter/etc are person centric - you follow the person
Lemmy/reddit/etc are topic centric - you follow a community
It makes sense for blocking on Bluesky to completely hide you, you've severed the person - person relationship.
On Lemmy severing a person - person relationship shouldn't disadvantage the user from interacting with the community. Communities don't want duplicate posts so if you post some big news in a popular community now all the users you've blocked would be cut off from that content. Their personal beef with you shouldn't disadvantage them in the communities this way.
This problem can be seen clearly on Reddit where blocking works this way, frequently abused by spammers and powerusers.