I'm just gonna chalk this one up to OCD. While Reformatted has been largely IDW-influenced throughout its run, it didn't start that way, when they began the line with Hexatron and the Predacons. Essentially, it's just become their catch-all line for everything that isn't directly based on the G1 'toon designs. Some of that change in design ethos also comes from switching up their primary designer. Cassy Sark headed up the line in the beginning, and a few of his base designs cropped up throughout, but he got pushed out eventually as the company heads started to favour IDW more.