Yaarel
🇮🇱 🇺🇦 He-Mage
Because most players DONT WANT to create their own setting.Why not leave that up to the player as long as there is no mechanical effect?
"I was bitten by a radioactive valkyrie"
"I am the reincarnation of a valkyrie"
"I trained in the valkyrie arts and didn't realize I shouldn't have been able to"
"The goddess of the valkyries blessed me"
"Destiny needs me to be a valkyrie"
"Pushups, situps, and plenty of valkyrie juice"
This has always been true. Gygax himself was surprised that players wanted to use his world rather than create their own world.
Obviously, D&D is a game for worldbuilders and character customizers too. (In a way the fallout from the ap-OGL-ypse demonstrated this.)
But there must be a default setting for the other players who want to play in an already developed setting.