The problem is Tolkein already wrote the story of The Rings of Power. It’s the third part of The Silmarillion, and the events therein are already laid out in exquisite detail. Not only is Amazon’s abomination making up different events, it is depicting characters with known histories acting completely out of character and doing things they never did. This isn’t like filling in the 18 years of Luke Skywalker’s childhood where we have no details, or doing a series that explores how Indiana Jones went from idealistic Eagle Scout to cynical professor. There are no real gaps in Galadriel’s history.
Like I said it’s fiction. Tolkien wrote it one way and if that’s what you want read it in Christopher Tolkien’s somewhat turgid words. The writers took a theme and wrote their adaption to get to the same place. You say “the problem is…”. I say there is no problem except in the expectations of the audience.