I've actually never read any of those books, though I think I get your point. But I wasn't saying that only D&D has this idea that common people can rise to super-duper-ness. The problem, in my opinion, is that the game assumes you want to become super-duper. That in turn convinces most players and GMs that if they're not becoming super-duper, something's wrong.
I don't mind games where PCs are amazingly powerful, and once I got used to the idea, I sorta enjoyed putting epic magic stuff into War of the Burning Sky's (and hopefully making it actually fit the milieu), but I don't know if it's possible to sell a D&D adventure series set in a war that doesn't end up with the heroes shapeshifting into cryohydras and crafting minor artifact spiked chains in order to attack a red dragon wearing lich earrings.
And that slightly saddens me.