It's the same for Sukuna.
He had to resort to Malevolent Shrine's must hit factor to even land a hit on Gojo.
Domain Amplification counters infinity but Gojo with even just Cursed Energy is so good & skilled at Close Quarters that it doesn't matter.
Their clash has basically been Domain clashes after that.
Gojo & Sukuna have a Domain clash where they are even inside, Gojo's barrier gets shattered from the outside & yet he is so good that he can heal up and fight even inside Sukuna's Domain.
They then try it another time with Gojo & Sukuna both changing barrier/must hit conditions to counter the opponents & when again Gojo loses, he can still wait with FBE until he heals his CT.
And now he's trying with something different again - probably increasing Potency by sacrificing range to force out Malevolent Shrine.
It's clearly not the same lol. One is actually doing damage and forcing their opponent to use up CE for keeping up RCT throughout the fight.
The effort put out by both have been completely different.
The thing is though, it seems like anything Gojo can do with his domain, Sukuna can too.
Gojo altered his domain barrier configuration? Sukuna did the same or countered it.
So, there's no reason to believe that this new miniature domain technique would be the difference maker. Chances are, Sukuna already knows it and can counter.
But, same can't be said for Gojo. His Domain is inferior rn.
Same goes for Sukuna too though.
Basic Cleave, Dismantle are useless.
Domain Amplification was useless.
Malevolent Shrine barrage was healed against & warded off with CE through FBE.
And as you said, everytime Gojo's healing his technique post using a Domain - so is Sukuna because he's also been expanding his domain, same as Gojo.
His normal options are for people who are far weaker than him, this is just a very high level match between Domains.
The moment they're both exhausted, they'll go back to Cursed Energy & Cursed Technique manipulation where we can see even more.
Basic cleave and dismantle are what's damaging Gojo and forcing him to use RCT. It's also what's breaking his domain and forcing him to use simple domain/FBE/CT healing using RCT.
It's so clearly not useless. At the very least, it's dwindling Gojo's CE reserve. And Gojo is up against someone who has comparable CE efficiency and much much more CE reserves. Every little drop would matter.
Domain Amp is bypassing Gojo's infinity hax and letting Sukuna cqc, which he's been dominating too.
MS has been discarded only once as opposed to Unlimited void being discarded 2 or 3 times. So, more RCT is used up by Gojo to heal his CT.
The exhaustion thing is exactly my point. At the current rate the fight is going, Gojo is bound to be exhausted sooner than Sukuna. All these little things like effort level, RCT spam, Domain expansion spam, simple domain, FBE etc are gonna add up and catch Gojo from the back.
And like Kinyagi said, what we're seeing from Gojo is everything we know he has.
What we've seen from Sukuna is not. 10s, Black box stuff, his real CT, Yorozu's gift are all still unused.