
Fuga isn't even a good attack in its base form; Sukuna needed to use binding vows to make it actually effective.
Sukunas Fuga isn't deadly because the attack is OP; it's deadly because Sukuna modified it with binding vows that turned it into a massive, hard to avoid, AOE with the power of a nuke by imbuing the dust created by his domain with explosive Cursed Energy.
Base Fuga did end Jogo but Sukuna kind of tricked Jogo into trying to overpower it head on instead of dodging it by playing to the curses Ego.
While Yuji might have Base Fuga, it would probably be the least effective tool in his arsenal given Denji is already alot faster than the people Sukuna considered normal Fuga too slow to be effective against.