I am not steeped in Ravenloft and its lore, but I've heard of it, read a few modules for it, and (a long time ago) interacted a bit with it in play.I am sort of torn on this one. On the one hand, lore is clearly important. If you take Ravenloft and rewrite the history of the setting, that is a radical alteration but it might also not be so bad if you want the players to experience it again for the first time.
To me Ravenloft seems more like a bundle of tropes - mists, curses and undeaths, weird prophecies, sinister spires, brooding and perhaps tortured evil masterminds - than maps and timelines LotR-style.
The same for Dark Sun. It's sand and city-states and evil sorcerer-kings and gladiators and psionics and ruthless templars; and once you're out into the desert, there are thri-keen and giants who stride across (and through) the dunes, and strange hermits at rare oases. Detailed lore doesn't seem necessary.
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