There's play test footage from early 2017 on YouTube and like you say there has been very little innovation in that time. Very similar looking textures and assets, even some assets missing (jets). I understand this DLC was probably a labor of love and the developers were probably working on this in their spare time. But did they even seek outside modders help? Just look at free mods that have high quality content and lots of it (RHS, 3CB, ETC) and the and work they've completed in short amounts of time compared to this DLC it really is disappointing.
