I only filter by subbed and (to not miss) also wanna see all the tech news I can get so I will sub to multiple.
I would like a design like crossposting but instead of either or the other make it a feature.
With your feedback in my mind I’d propose this idea:
Share the discussion as a user to another community like crossposting. As a visitor/browser of the communitx it was posted on, you can now set a switch to either see all content discussed by all communities in one post (and somehow federated to all other instances) or filter by a specific one because one instance is always the toxic one.
If a mods decides it doesnt fit, he doesnt delete/take down the post but instead defederates the instance from this one post.
With that design it should combat spam posting the same post as it can’t be spoofed.
It would also respect user blocked instances.
Sort of a federated post in the fediverse.
I don’t know how that would be solved in lemmy nor the fediverse protocol but it sounds plausible as a standout feature.