You can still get usable assets from cad software - I used to be big into mods, and I’d usually start any object models by throwing it together in Inventor then porting it to blender for the texture/UV/rigging/etc part. It’s not super efficient, thats for sure, but if you think better in breps than polygons (like me) it was a good workaround for having to learn new skills…

I can’t think of an occasion where I’ve been listening to something online and wanted tracks - everything that would benefit from having them, I would prefer to download and run via VLC anyways. I think there just isn’t any demand for the switch, and it would break a lot of legacy tools (like auto-transcription bots) to switch, much as .webp has.