Cross-posting on StackExchange sites
Is the posting of conceptually equivalent questions on different Stack Exchange sites discouraged?
I am asking for an official answer on this, because I was surprised at one of the answers to a different question: Should there be a way to search all Stack Exchange tech sites for potentially overlapping questions? . It seems like a strange position for SE to advocate duplication across its sites, and makes it unclear why we have all these other small sites.
I also found a post which seems to argue that it's not even permitted ( Is cross-posting a question on multiple Stack Exchange sites permitted if the question is on-topic for each site? ). I don't think it's a duplicate though, because there's a difference between posting conceptually equivalent questions on multiple sites and cross-posting an identical question.