It would help, but frankly I think there needs to be more - both because it would be helpful and because, up to this point, Lemmy is mostly following in Reddit’s footsteps in terms of features.

Consider a “multipost” option, on top of the existing crosspost. Multiposting something to another community would push the post as-is (no edits allowed) there, then collate all comments across all communities it had been multiposted to into one comment section displayed on all of them. The original community each comment chain originated on could be marked on the parent comment, and child comments could automatically be routed so they originate from the parent community of the chain.

Just spitballing here, but something like this would help bridge the gap a lot more than just a multireddit port.