While you were correct at one time, you are not correct with the current presentation of D&D.
The D&D multiverse, according the books and public statements from people at WotC, is everything that is D&D.
Even your table that denies that it is part of the D&D multiverse is part of the multiverse...
Nope.
the D&D multiverse exists whether or not your world has Planescape. All D&D worlds are part of the D&D multiverse, even those that don't connect to others.
I'd play goblins a lot more if their implementation wasn't so weak compared to the two other goblinoids from WotC.
Halfling, Goblin (usually a re-skinned Hob) and Goliaths
I agree with all of this, except the idea that "stories have a structure...RPGs are messy"
Stories are quite messy. Two people can read the same story, watch the same film, listen to the same podcast and come away with different meanings, see different main plots even.
To me RPGs are stories...
Radiant Citadel gives several examples of adventures that take place mostly within the Citadel and its environs.
Good groups can have opposing goals and may even choose violence to accomplish those.
Because it feels weird to roll three dice on d20 tests.
The even/odd technique would do similar.
But also I don't think there needs to be narrative riders on EVERY roll. Narration should already occur without the weight of Hope & Fear.