I will admit that overall I have no full understanding on how copying of CT works but what aside of Sukuna Plot Armor Barrier stops Yuta from Using Angel CT and be done with it
Well Sukuna just have to endure due to time limit.
There is no time-limit for Yuta in domain expansion.
What plot armour barrier? Reggie used Hollow Wicker Basket against Megumi. Although it was not effective because Megumi cast a domain without a sure hit, it is a technique we already knew about. Normally, you would be fucked because your hands need to be clasped together to maintain the barrier but in Sukuna's case, it is just a nerf since he has two other arms.
I love the way this fight is going. The fact that Rika can split up into smaller pieces makes me understand that Yuta is even more powerful and versatile than I thought. If Sukuna does not get his domain back soon, I don't see him surviving this. Either Yuji whittles Sukuna down with his punches and or they get Sukuna to unclasp his arms for it to be game over.