I would say less mature in terms of a certain aspect of (to Tolkien- religious) wisdom as it can be said that Galadriel was more 'worldly' (power hungry and active in the world as a leader) before the events of Fellowship but once Frodo encounters her she is one has already given up on the fallen world (like real Christians and Buddhists do) and is ready to leave it (to the Grey havens, which symbolizes the afterlife ). Naturally she has already given up on worldly power (that is why she rejects the temptation of the Ring).
Her mind is one of one who is ready to leave this veil of tears, this great suffering behind. Which is a very religious sort of characterization.
Galadriel isn't in the books very much and like Sauron her deeds are talked about in the lore history/notes (Silmarillion) so its open to interpretation/adaptation.
There is a lot of hate I noticed from 1. Tolkien purists who worship the texts and want everything to be 100% the same 2. Christians who have co-opted the work, see it as a Christian allegory and find Amazon's effort offensive. 3. Culture war people from the Right like Critical Drinker, right wing pundits and many other content creators who hate it mainly because they hate the people who made it, and their style of writing & directing.