Tolkien's work is not a multiverse. There is supposed to be only one canonical set of events and characters which primarily are based on what he wrote. This nonsense that we can have 5 different versions of the second age based on 5 different studios 'interpretation' is not what Tolkien wanted. Marvel owns their IP and can do what they want with it. Tolkien is dead and the Tolkien estate is basically farming off part of his story for money. Amazon does not have the rights to tell the "definitive" story of the second age, whether Tolkien fleshed it out or not. Whatever they are doing is not canon and is just a made up story that is not literally part of Tolkien's legendarium. So this show is just that, a billion dollar "what if" fan fiction. Which makes their claims about being ground breaking totally disingenuous and phony. And if that is what the Tolkien estate is allowing then shame on them. None of these made up characters are canon and nobody has to respect them if they do another version of the second age. And nobody has to follow Amazons 'compressed' timeline, nor do they have to respect the made up narrative they have created outside Tolkien.
What you are basically saying is it is OK for any studio to just throw some crap into the second age and call it Tolkien.......
Now if you like it and all, then thats fine, but to call this Tolkien as if it is canon, is false. And the reason why so many people are complaining is because Amazon themselves have tried to sell this show as a literal canon version of the second age story when it isn't. At the end of every episode it states clearly that this series is only 'inspired' by Tolkien and that even if the characters have the same names as those from Tolkien, they are not literally based on what Tolkien wrote. But they put that at the very end of the credits in a place most people wont ever see it. Amazon knows it is not canon so as long as we keep it at that then fine. But it is the marketing of trying to have it both ways in pretending that it is canon while in the small print stating it isn't is the problem