The Shock absorption isn’t a defense, it IS the health bar, and the correlation between the numbers seems incredibly strange.
It functions as a defense. It blocks Weakened Might's 100% attacks. So he punches harder than his 100% to bypass the shock it can absorb.
It is an anime-only enhancement of the scene, but we eventually see the Nomu get pushed back in that version during their punch barrage exchange.
The shock absorption Quirk has a set amount of energy it can take before it reaches its limit and stops working.
This isn't contradictory to the premise of the debunk.
Like I said, the "defense" is just a figurative representation of the shock absorption.
To get to that limit, Weakened All Might needs to punch it over 300 times, while Prime All Might only needs to punch it 5 times.
The debunk already addresses this. I believe I don't have to reiterate it.
And what does his Plus Ultra matter at all? Why did it suddenly double from 300 to 600?
I'll mimic your surprise and ask you, why are you asking why the Plus Ultra matters? It's quite literally how All Might beat the USJ Nomu, he went beyond his 100% in each punch to overpower the shock absorption.
All Might doubling in power represents him going Plus Ultra.
And again, the debunk
is not saying that All Might did in fact double in power in actuality. It's just explaining the logic of the premise. In case anyone gets confused with that.
The shock absorption Quirk absorbs ALL of the force behind those punches.
It was able to absorb All Might's 100% punches.
So he went beyond and overpowered it through attrition.
It's self explanatory and happens within a few pages.
It does not have an arbitrary limit that lets some of the damage go through, as far as I know
We saw its limit when All Might surpassed it by going Plus Ultra.
I'm not really sure what this is even, nobody ever implied that the limit is arbitrary, we're just going off from what we saw happened.
That seems extremely arbitrary and much more complex than the straightforward answer.
It's actually a very simple, basic concept.
The reason why it's explained in detail was because, quite frankly, the discussion about it within the MHA powerscaling fandom was controversial and a lot of MHA powerscalers weren't literate enough to understand it or were arguing in bad faith to bury opposing arguments.
I guess to throw numbers myself:
Nomu has 1 HP, but has a 300 Shield. All Might only has a 1 in his Attack, so he needs to punch 300 times to get rid of the shield.
Prime All Might only needs to punch 5 times to do the same. So he would have a 60 in Attack.
The flaw of this premise is that you're treating the Shock Absorption Quirk as if it works like Tengai's barrier, like it's a shield that needs to be chipped away.
It's not how it works.
Even if we consider it like that, then we're still gonna deal with the fact that the USJ Nomu was made to be as sturdy as All Might and, as how we in the wiki currently treat it, that level of durability is wholly independent from its shock absorption Quirk.
So even if All Might broke the Shock Absorption quirk per this logic, he'd still have to deal with a Nomu that's presumably as durable as himself.