Not sure what you mean by “packed together”. It’s just a folder with uassets exactly like all the others folders in your content folder. There’s not really any other way to pack them.
Second if you buy Unreal specific files such as a zombie character on Artstation complete with blueprints, control rig, skeletal mesh, physics assets, clothing, materials, weapons, textures, etc then of course it is going to be a folder with uasset files. That’s the whole point of buying an Unreal asset. So everything is ready to go specifically for use in Unreal. I have no problem importing fbx or obj files, that is not the issue. The issue is importing uassets specifically
Or if I’m following an Unreal animation tutorial on Youtube or from a paid course and they include the assets that we will be animating as a uasset file so that I can follow along with the instructor. It should be simple to use the uassets that they provided. However that is not the case. And that is the issue here.
If you don’t see how this is a problem then you’re lucky that you have not had to deal with this issue but many others have, judging by a quick search before I posted this question here. There doesn’t seem to be any solution to importing third party uassets it seems, other than having to reconnect everything and hope for the best