While we're at it: crossposts in general should go or he handled differently. The way things are, crossposts will create new posts with new comment sections like reddit did. Yet
a) if something is of interest to two communities, chances are, ppl who are interested are already in those two communities, so crossposts will only clutter their feed
b) it splits up the discussion unnecessarily
Why not have corrsposts as mere.links to the original post so everybody can join in? The way things are, each crosspost will turn into a circle jerk of all the same arguments regurgitated by different people in different communities.