Nobody is saying that. What we're saying is that D&D, until 4e talked about quests, never ever provided even the slightest support or help with that. I mean, it WAS acknowledged as a thing that happens, but GMs were simply left totally to their own devices on questions about how, when, why, etc. Beyond that, sometimes D&D actually took a stance AGAINST it. 2e is infamous for this! "Oh, you want to make a magic item!? HAHAHAHAHAHAHAHAHA, go harvest the dying breath of a star, sucker. Oh, and what does that mean? Good luck figuring that out!" I mean, you COULD interpret it to mean "give interesting plot hooks" but the whole thing was almost universally interpreted by GMs to mean "make it so hard that the players will be discouraged from doing this, because you know those sneaky players are just trying to get some vorpal weapons!"