Also, figuring out how to get all the players clued into setting lore is a thorny problem. You’ve read the lore bible, but that doesn’t mean your players have.
And sometimes you can pull off big things with that. Raxados the Betrayer may be a Big Deal, and fighting him can be the “dueling freaking Darth Vader” moment of a campaign, but you either need dozens of sessions in other campaigns in the same world or lore knowledge to understand how it’s a big deal.
Neat example: a big part of Mythender’s appeal is the way it draws on IRL lore that all the players have some connection to.