Opinion too complex.
I care about the lore that has been established in game as a part of my campaign and alterations to that. My game is long-running, with a campaign that, depending on how you look at it, stretches back to 1981. So changing the lore in a way that contradicts established material in my game is bothersome to me, and is significantly more bothersome the more deeply it is integrated into future material.
I don't really care about changing the lore on established settings since I run a homebrew world. But I am huge on continuity, so I find it a bit baffling and depressing when a new release retcons or rewrites established lore. I love expanding the lore, but not advancing the time line. And I hate metaplot imposed on a setting with the fiery passion of a million exploding stars. The setting should serve your campaign, and your campaign shouldn't have to adapt to a changing setting that wasn't created by your game's events.
For example: 3e changed orcs from LE to CE. I have an established culture of orcs imc that leans heavily into the fact that they were lawful in older editions. This is easy to deal with, though; I just split orcs into savage and civilized groups. So, this was a change that was of concern to me, but easily managed.
Compare to the way 4e changed succubi into devils. I have long established a demon princess of succubi (1981!), and she has played a major role in several campaign arcs over the year. So I pretty much didn't use succubi in 4e, and am happier with their change to a sort of universal fiend of seduction in 5e. This was a change that had ramifications for my game, and directly contradicted established lore that pcs had interacted with significantly. No bueno.
Meanwhile, something like the arbitrarily changing map of the FR from 1e to 3e would horrify and offend me- if I played the FR. Instead, I find the change baffling and inexplicable. Someone had used those vast trackless glaciers and deserts in some way that the changes contradicted. This was a pointless change (imho) that only served to contradict some home games' events- in other words, unjustified and unjustifiable.