As someone who had not read the books before seeing the movies (I know, I know) it added a lot of context when I found out why the elves were leaving at the end

As someone who had not read the books before seeing the movies (I know, I know) it added a lot of context when I found out why the elves were leaving at the end. I remember wondering why everyone was leaving if they had won. I know it was already long, but I wish they'd explained the ring's connection to magic better. It also would have explained why everyone was so willing to take the rings of power in the first place, and given more weight to the somber tone at the end.