I think this was always the case. Most Wikidatans are as at home on Wikipedia as they are on Commons. The issue you describe also happened to Commons - both communities feel the other is less focussed on quality. Many Commonists spend hours on high quality images and these are rarely picked up by Wikipedia unless a Commonist notices and does so in their own language. There is no requirement for Wikipedians to get to know any other project and this is normal wiki behavior. We don't want anyone to feel pressured to do anything they feel uncomfortable doing. It's already difficult to get Wikipedians to do small tasks like add catagories to their articles. The list of things necessary to create an acceptable article on Wikipedia just seems to get longer and longer, while the associated work for illustrations of that article or for data of that article is not even mentioned in current AfC policies on Wikipedia. I have thought about this, but I still think we need to break down the list of things necessary to make new short articles on Wikipedia, not extend the list. So in summary, I think that what you describe is normal predictable behavior for a "Wikipedia support" project such as Commons and Wikidata. This will change as more and more external users find out that Commons and Wikidata are valuable resources in and of themselves. This is already the case for many GLAMs which have found collaborations with Commons to be valuable experiences. I have high hopes this will become the case for Wikidata as well.

Jane