Yes, I probably went a little further, but it was to better contextualize the very nature of a platform like Lemmy.
To be more succinct, I can simply say that Lemmy (unlike a Friendica group/forum or a GUP group) doesn't support immediate crossposting (basically you can't mention several Lemmy communities to have your post published on each of them) . This limitation must not be removed because it is the basis of the anti-spam check by default which must be present on a link aggregator.
This is the biggest systemic difference between Lemmy communities and Friendica groups.
And crossposting has become the most important function that the fediverse has recognized to GUP groups. Even with excesses that often go beyond the limits of "fediquette"...