@smallcircles@social.coop personally, I feel that asking people to post or continue a discussion on another platform is a roadblock that shouldn't need to exist.

You can't do it on Discourse, but in NodeBB you can "categorize" a topic, even if it came from the microblog-fedi. Similarly to how you can import a reply tree into another Mastodon instance. That's the difference, that the software should support something like this, although I get that that's not always important to every piece of software. Discourse does technically support two-way federation, replies are sent and received, but it primarily broadcasts content. You can't currently browse fedi from Discourse.

Things get a little more confusing if a topic is already categorized, like a Lemmy/Piefed post in a community, so I expect some of that to change in the coming months.

End of the day it would look something like "cross-posting" as currently exists on the threadiverse.