"Again, canonically, everything in Marvel, including the First Firmament, comes from the OAA, and the only thing that we currently know canonically comes from the First Firmament is everything within the later regular Marvel multiverse, i.e. Eternity, who is an infinite-dimensional construct of time and space, in our most generous interpretation, but explicitly only treated as 2-A within this particular story."
First of all. Not my point, nobody is taking about the OAA but you. Secondly, no again. Everything that exists in any multiverse comes from the FF. Thirdly, Eternity is not 2-A in this storyline, I've debunked this already, you just fixate on any lower-sounding explanation and forget any higher ones.
And even if Eternity was 2-A in this storyline, I have to ask: So what? Does this disprove everything else that makes it High 1-B? No. So why bring it up?
"Oblivion, and the Beyonders both originate outside of it, and we definitely cannot distort the fundamental scientific definition of the word multiverse to make it mean something that it does not. Even theoretical typer IV multiverses are still infinite-dimensional, not completely metaphysical."
Yes, and which is why both TLT, First Firmament and the Beyonders being 1-A makes sense. I and Lucky have already shown you numerous instances of characters weaker than them having 1-A definitions, but you just fixate on them not being because "The Living Tribunal is the multiverse". Again, this is no different than saying that Yog-Sothoth is High 1-B since he is the embodiment of the multiverse. You are just fixating on one explanation and ignoring everything else.
We've seen numerous Marvel characters be outside all space and time, we know that the outside of Eternity (Embodied by the Never Queen) is 1-A, in both Defenders and Fantastic Four it was shown, yet you insist that it is "A higher level of High 1-B" despite the narration stating that it is outside all space and time.
"Anyway, I am extremely tired of these types of topics."
If you are, why do you keep debating them? Debating while tired only impedes your judgment.
"My apologies, but that is final. End of discussion."
Please, don't talk as if your opinion is law. This accomplishes nothing but to push others further away from it.
"our most extremely generous approximation"
Stop describing anything in Marvel like that. There's 8 different instances that prove an Infinite-Dimensional Marvel Multiverse. It's one of the most consistent of any High 1-B fiction we have on our wiki. There's more proof that Eternity is High 1-B than proof that the Chousin are 1-A.
"The FF is larger, yes, but a larger being of the same dimensional level per definition. See it as if somebody chopped off your arm, and it mutated into being alive on its ow"
This is a terrible analogy. You keep saying that it is the same "Dimensional level per definition", but the only thing you are saying is that "It is a multiverse, so it can't be 1-A".
This is just as flawed as saying "This character is a human, so he can't have Higher-Dimensional powers", or "This character is a little girl in a frilly dress, so she can't be Universal", or "This is a cute pony, so she can't destroy stars".
Sentient embodiments of multiverses don't exist, and judging the First Firmament per definition is the same thing as judging a character by virtue of its size. It's like arguing that a Megazord is stronger than Goku because it's bigger. Sure, First Firmament is described as being the original universe from which everything emerges, but the infinite-dimensional multiverse is just a portion of the cosmos. There are undimensioned spaces outside of it, and characters who exist in and embody such levels of reality.