Why does everyone act like domain refinement is the most obvious thing in the world and say domain diff to win an argument?

I am referring to when two sorcerers have domain expansions, and they use them against each other. Gojo and Sukuna are the only sorcerers with feats to back up their domain expansions. Besides that, it's genuinely just vibe scaling for the most part.

I have seen people arguing about whether Yorozu beats Yuki, or vice versa, in a domain clash, and I'm just sitting there thinking. How? Both of them are completely featless in domain clashes. They have zero feats of refinement, nor does either of them have any statements about how good their domain clashes are. I have also seen the same argument regarding Kenjaku vs Yuta. People say Kenjaku wins the clash, but he has never clashed against another sorcerer in the series. I won't say he doesn't have the open domain expansion advantage, but how do you prove that it will break Yuta's domain in 3 minutes, the same way it took Sukuna 3 minutes to break Gojo's domain expansion?

I have also seen the same arguments be used against Yuji. Everyone says that Yuji will lose every clash in the series, but how do you prove that? Hanami, Yuki, Yorozu, Uro, Ryu, and cursed Naoya all have absolutely zero domain-refinement feats or statements about their domain expansion. Yet everyone thinks Yuji's domain expansion will crumble instantly like Gojo vs Jogo's. How do you prove that, though? You can make an equally valid argument that all of their domains are just as bad as Yuji's or better than Yuta's, since there is absolutely no basis.