Sets of 3D Models from Assets in one file with one UV

I'm trying to set an easy workflow for artists (mainly without 3d experiance) to work in 3D Collection.

Shouldn't the assets from sets be downloadable as separate objects? And have separate UVs? For example this hard cover book - https://substance3d.adobe.com/assets/collections/f79e7de8cf47a3658251ea233e0565b7bfd8c912/asset/93109c999d7b38c8cf54e7a0ffb5428b15c02273 - is supposed to be used for quick 3D mockup, but the opened and closed book is in one file with single UV map. I'd need external app to import, delete one of the books, maybe could count on AutoUVs from Painter - but still it's a couple of extra steps. 

Am I missing something? I know I can split the objects in Stager, but still, it's an extra step which people with 3D knowleadge can accept, but it's complicating workflow for people trying to get into 3D, whom, I suppose, Stager app and Assets are dedicated for.

Thanks for any ideas in advance