The only „restriction“ that I’m aware of is that different editions should have their own top-level folders if you’re adding local extras to them (and not multiple edition files mixed in the same top-level folder).
That’s how the handling of different editions is documented and working. Nothing dismissive about stating that.
There’s a feature suggestion asking for an option to support adding files of different editions into the same folder and let them share any local media assets (posters, themes, backgrounds…) and extras.
Beyond that… I’m not sure if this is what you’re talking about as you refer to a bug reported 18 months ago without any links/references, while pointing out you’re not sure that’s actually the case because you never tested it (unless I’m misreading your post)
