I don't think it has, in the sense that I don't really care - or, to put it a little less brusquely, the quest for an established canon, the attempt to canonise an authoritative text of Tolkien's legendarium and weed out uncanonical variants, doesn't interest me very much.
The discussion here reminded me of
Mnemo's old thread
Tolkien and Negative Capability, and revisiting it I found I can still largely subscribe to what I wrote back then. Also I still think the distinction of writing vs worldbuilding is relevant here. Let me try to explain.
If your focus of interest is in Middle-earth as a secondary world to be fleshed out in fan fic or role-playing games, you'll want to keep it coherent and lore-friendly. You'll have to make up your mind whether sentient demonic cats are a thing in this world, or only sentient demonic wolves, and whether the vampire Thuringwethil was a werebat or something more Dracula-like; and if you want to use Tevildo and Oikeroi you can't have Sauron and Draugluin/Carcharoth in the same setting.
If, on the the other hand, your interest is in Tolkien's writings as works of literature, the existence of widely differing versions is in itself not a problem; but there's a further bifurcation. If you approach the Professor's writings as a philologist trying to establish a definitive text of What Tolkien Intended (or at least What Tolkien intended at a given time) you're back at the quest for coherence, sorting canonic wheat from uncanonic chaff.
But if you just read Tolkien for your own aesthetic pleasure (and if you haven't guessed it, this is my preferred approach) all that ceases to be a problem, and you can appreciate each and any stage of the legendarium for its own merits. You can have Tevildo and Carcharoth living happily side by side in your imagination (as far as this is possible for felines and canines); you can have the fairy-tale BoLT story of Melko being chased up the Great Pine of Palúrien (again, much like a cat!), but also the metaphysic speculations of
Morgoth's Ring, and I wouldn't want to forego either.