I'm on the same page @lighteye
If we would assume that same content must be in both languages under just one post, then I wonder shall we say about those people, who are publishing 'series' on some particular topic? You could also tell them that they should pack it all in one publication, instead of breaking one topic into 3-4 posts.
should we also be strict towards those authors and encourage/enforce them to post all their series within one article?
Yours, Piotr