Over the course of the entire story, we’ve had several examples of this philosophy in play and paying off. On both sides, including Curses.

Comparing Yuji and his recent feats to any other sorcerer is downright ignorant of the fact that until Itadori was conceived via arguably the smartest sorcerer in the entire story (Kenjaku), Sukuna was legit just floating around as fingers being a cursed object (taught to him by Kenjaku btw).

Let’s also remember that this man turned himself into a woman and created the vessel for Sukuna by procreating with the reincarnated soul of Sukuna’s twin, whom was eaten in the womb.

The ideology has been engrained into the manga from the very beginning that a sorcerer’s growth is not linear.

Based on the translation of 257, Yuji literally just learned how to use Shrine by awakening it during his Black Flash spree. Furthermore, Yuji is a huge anomaly in the world of JJK given the entire foundation of his birth and capabilities.

And last but not least, even the king of curses directed this thought process to Megumi: why did you run away?

If you want to grow, put your life, your existence, your morals, your wills, your techniques on the line and grow.

That is what makes both Kenjaku and Sukuna unique. Their barrier-less domain exists to paint the world as they see fit because they do not lack imagination in how the conceive their abilities and utilize them. Even Kenjaku told Yuki about her fallacy by not using DE against him.

In this story there are a literal 3 characters who defy this: Toji / Maki who throw away sorcery for heavenly restriction. And Yuji, whose mentality counteracts everything Sukuna and even modern sorcerers believe in.

There isn’t some asspull should he learn domain expansion or unlock and master more techniques. These fights are not meant to be fair but they do follow a specific trend which is swing to the fences and win by any means necessary.

Sukuna literally manifested a slash to cut the untouchable thanks to Mahoraga. But most importantly, he fought Gojo under specific and strict circumstances willing to die for these results.

My two cents.

Todo’s explanation on black flash

Examples of statements from above — there are more but I’m lazy