There should be a separate category for characters with Unreal and Unity projects, like it used to be on the Unreal Marketplace. I would actually remove smart assets altogether and just keep it the way it was on the Unreal Marketplace. You go into the “Assets for Unreal” category and then choose environments, characters, plugins, etc.
3D models should be separate—whether they come with animations or not, that doesn’t matter.
In fact, that’s how it works now, but this “smart assets” category just confuses everyone.
These are just thoughts. I don’t claim to have the ultimate truth.