Voadam
Legend
The problem with leave lore for setting books is that there is no baseline lore a setting can rely upon or diverge from. The 24 DMG provides no monster lore for its sample Greyhawk setting and relies upon the MM or the DM to fill in its blanks. Greyhawk and Forgotten Realms and Dragonlance and even Eberron have traditionally relied upon a lot of core monster lore and generally only specified when such things diverged such as Dragonlance's Graygem origins for minotaurs and goblins and ogres or Eberron's druidic culture generally neutral not Gruumsh based orcs.
Leaving lore for settings means leaving a lot of core monsters without that baseline lore ever being specified.
Leaving lore for settings means leaving a lot of core monsters without that baseline lore ever being specified.