Well I firmly believe most of the friction is just basic "not invented here" sentiments, which we have seen since Commons was started. Maybe there is some central page there that we can follow which is dealing with the same basic issues? As I recall one of the biggest problems in the beginning was the semi-automatic deletion of PD Commons files lacking proper copyright tags when the uploaders weren't informed and worse, not having the deletion show up in Wikipedia watchlists when the file was used by other editors in various language editions of Wikipedia projects. I don't know of any other issues that turned acrimonious in the early days of Commons, but this new "Wikidata state of affairs conversation" (if you can call it that) is pretty much the same problem.