I would consider that a plot hole that the author just didn't realize at the time considering how it invalidates Sukuna's whole plan with mahoraga and how Mahoraga's whole power works and it's solution was to cut space to bypass infinite. Though I'm talking about purple I don't remember Blue doing that to him what chapter did that happen in.
No, it's just Gege wanting Gojo to lose and didn't know how despite Gojo was still fresh while Sukuna wasn't. That was the precise issue people had with Gojo's death next to his horrific character assassination isn't that he died, but his death was offscreen, made no sense at all with how his Six Eyes worked and he was character assassinated.
Are you forgetting Domain Expansions exist and how they work they make UBW useless.
...How would a
Domain Expansion make a
Reality Marble worthless? This is the equivalent of saying a Nuke can defeat a Servant because not only is that not even remotely true, you are just pulling shit out of your ass about it. When has a Domain Expansion show anything that can exceed a Reality Marble's power? When has it exceeded a Reality Marble's range? How will it be able to upend a User's Inner Soul, their World, their Reality planted onto the surface of the Planet and is able to make the impossible possible?
Saying it doesn't make it true because it never is.
Who do you think is beating EMIYA in a Domain Clash? Sukuna and Gojo, sure, but I'm not saying it would work on them.
AND OF COURSE HE GIVES UP ON EVEN POINTING OUT HOW DUMB THIS QUESTION IS AND HOW IT MAKES NO SENSE! Every single time, users say some of the stupidest shit that can easily be disproven... yet no one steps up and they allow the garbage into play. How would Sukuna or Gojo's DE overwhelm Unlimited Blade Works?
Ionioi Hetairoi? Koyanskaya's Reality Marble? Unlimited Lost Works? How do they do so? Like they never understand how it works and forget that DE's don't have unlimited range(Hell, they are only a Hundred Meters across at best and some are even smaller) while Reality Marbles are absolutely GIGANTIC(Iskandar's is explicitly hundreds of miles around considering his distance to Gilgamesh and the Hundred Personas in Fate/Zero).
They come off more like discount Bounded Fields, not Reality Marbles.
Domain Expansion (領 (りょう) 域 (いき) 展 (てん) 開 (かい) , Ryōiki Tenkai?) is an advanced barrier technique and is considered the pinnacle of jujutsu sorcery. It constructs the user's innate domain inside a barrier infused with their innate cursed technique. Within a domain expansion, the user's cursed...
jujutsu-kaisen.fandom.com
Reading this makes the wanking for Domain Expansions, let alone Gojo and Sukuna's, even worse by proxy because:
A domain's can't-miss attack can sometimes be countered with cursed energy reinforcement, but this is an impractical method. The only true defense against can't-miss attacks for those who cannot expand their own domain are anti-domain techniques.
New Shadow Style: Simple Domain and
Hollow Wicker Basket neutralize the barrier's embedded technique in order to nullify the guaranteed hit function.
[19]
Because Nasuverse Mages, let alone Servants, already have the means to Reinforce themselves with magical energy... it's called Reinforcement and Resistance. Servants meanwhile can just dope themselves on Magical Energy, this isn't even getting into the rest of the countermeasures are so damn simple from outside JJK. Hell, it even has the same deal with Domain Clashes that Reality Marbles do but it's even less powerful than that:
The best countermeasure against an opposing domain is to expand one's own domain. This will engage both combatants into a clash of domains where the more refined domain will conquer.[22][23] The time it takes for one domain to dominate in a clash varies on that difference in refinement. E.g. Satoru Gojo's superior domain immediately dominated Jogo's while Dagon's domain took a much more significant amount of time to subdue Megumi's. In the case of overlapping domains, sure-hit effects cancel each other out.
[24] When two domains are completely even and the users fight with their domains open, the moment one combatant takes heavy damage or their domain collapses, the other's can't-miss attack will immediately strike.
[25] A clash of three domains is even more complicated than two and too many conflicting factors can cause the barriers to shatter before the domains are completely formed.
[26]
Domain clashes don't always have to result in one domain conquering the other. Using Domain Expansion against a more refined domain can create a hole in the barrier for them to escape from as well.
[27][28]
So what they are saying doesn't even work nor make any sense unless they are trying to say Domain Expansions > Reality Marbles which is god no.