It’s probably because they are still working on some areas that need improvement. For example, when migrating from Sketchfab to Fab, they expect high-quality 3D assets, but they can’t get them because someone decided to skip the DAE format. This decision blocks the migration of models created in Substance Painter and a manual solution is no go! because the quality isn’t up to Sketchfab’s standards. You can read about my problem here Request for Improved FAB Integration with Substance Painter Models - General / Feedback & Requests - Epic Developer Community Forums
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