In current meta vs Madara it would be useful but when he was added it was 1000% stronger to have his standard and chase pure ninjutsu dmg for 2 reasons:

1) Gamariki summon lowers only resistance so pure ninjutsu damage increase from this summon was and still is to this day disgusting (for tai/nin 50% effectiveness)

2) Naruto scaling is purely ninjutsu based so for tai/nin attacks again its only 50% effective

so adding 1 + 2 = standard attack / chase that would hit literally for twice less minimum of what Naruto was able to do. (that would actually be a solid balance change after his release that would make him less broken and more relevant now but hey we don't balance anything in this game)

That's also why Rinne Sasuke damage was never good, majority of his damage is tai / nin but he scales only ninjutsu so even when you would think on paper scaling like 80% ninjutsu with chakra per round is "insane" in reality it's not.