I think what made KotBL so great was because it was our own lore that was created. Not official lore. Tales of fighting the owlbear, pitting one clan against the other, freeing the mad barbarian or letting him hang, getting skewered by the minotaur, learning what "bree-yark" really meant, or even taking over the keep for ourselves.
Me personally, that's what gets lost in modern adventures--how players created their own stories and tales. Not something predetermined. All the pieces were there, but how each group approached the caves was different. Heck, every time we played it, we approached it differently. That's harder to do when an adventure is more fleshed out and the NPCs have predetermined motivations and personalities. YMMV of course.