WayOfTheFourElements
Hero
There are no flying humanoids, or people with the ability to make magic items? How do they get made then?
The default setting of 5E is magic items exist, and can be made (see Xanathars). That's not universal though.
In any event seeing as your world has magic items, I presume one can buy them, or contact an Archmage or similar and offer to complete a quest for one?
I doubt a "default setting" exists at all. I don't even see how one is possible. No campaign is every played in the "default setting." They are played in the the DM's handmade world, Forgotten Realm, Greyhawk, or some other published setting.
Moreover no two DM's version of the Realms are identical, though they may share certain Greenwoodian elements. The same applies to any other published world.
Maybe I misunderstood what you're attempting to express.