Hi! Disabling BIM feature recognition in 2018 is to support more geometry type and support Inventor assembly also. It would be ideal if Revit and Inventor could exchange models seamlessly. However, the two CAD systems were targeting two different customer bases from different industries. The technologies involved in the two programs are fairly different, although they belong to the same company. We are intended to make it better. Inventor team has hosted a Beta program, where you can try out the latest install-free Inventor build, give your feedback, and interact with project teams in real time. Please feel free to sign up from the below link.
https://bit.ly/InventorBeta
Many thanks!