Butting in here, my response would likely be to either not even notice the change (if it were minor) or to compare the change to what I had known before and take the bits I like best from both versions.And if WotC were to strip out 95% of their lore, and this was not a positive for you, what should your response be? What I'm inferring from some posters here is that the only acceptable responses to change are meek acceptance or quiet abandonment.
So a question for you: in the 5e Monster Manual (and possibly in 4e as well), there were a bunch of changes to things like monster origins. Creatures that used to have "natural" origins are now created by demons (gnolls, lamias), through divine transformations (harpies), through regular curses (peryton). Orcs and goblins went from being evil because they're evil to being evil because they're micromanaged by their evil gods. Beholders used to be born. Now they're created in dreams. Did you notice? Did you care? If so, why? Did you just "meekly" accept the change, did you ignore it in favor of an earlier interpretation, or go "huh, this could be interesting?"