I have seen no discussion of this. What would you like to see in version 5?
I have some ideas but there is no reason I can see why this couldn't be implemented in version 4.0.
It could use the automated tracking of file paths to have a preset location in the project it's downloading into and update plugin assets without issues. Like anything that would usually go into the main folder could be placed in its own folder. And then every time you updated that asset it would feed the selected assets into that folder.
This can already be done manually by adding to an empty Godot project and then dragging the files over to the desired folders but that is not automatic.
- More advanced manipulation of exported arrays. Re-ordering and dragging multiple files.
These are just some ideas and you probably wouldn't need code breaking changes to add these features. They might not be popular. Has there been any discussion on Godot 5 yet?