Lots of really good feedback with which I agree! I’m coming from “the other side” as a Sketchfab seller, and would add that the loss of core Sketchfab features is devastating to me as well as to many of the members of my community for promoting 3D art and tools, Interconnect3d.com.
On the Sketchfab store, we used to be able to display a beautiful, performant 3D viewer at the top of our product listings, while now FAB seems to use an inferior 3D viewer as secondary media. We used to have a robust commenting and “likes” system in the Sketchfab store, as well as separate customer reviews with star ratings AND comments.
I sincerely hope that Epic will do better than they have with this launch, and listen to feedback from long time customers like us.