The most important articles will get cross-posted everywhere organically and people looking for "discovery" (self-promotion) will learn to cross-post as well.

The most important articles will get cross-posted everywhere organically and people looking for "discovery" (self-promotion) will learn to cross-post as well. But I'm skeptical about replies getting cross-posted between communities, which seems like a great way to keep silly arguments going when it would be better if they died out? It reminds me of accidental reply-all on email lists. So it seems like automatic cross-posting only links and questions might be enough?