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.