Defensive ninjutsu really isn't a big thing in Naruto, and most of those are either bloodline techniques or hijutsu .
I can think of maybe four or so: Susanoo for the Uchiha, Kaiten for the Hyuga, Lightning Armor for Kumo's Kages, and Gaara's personal Sand techniques. There's also a Chakra Shield thing that puppeteers can do, but that involves cutting your arm off.
The only one we can learn at the moment is Kakuzu's Earth Release: Earth Spear, which is a B-rank, and so expensive that even his S-class self can't leave it active all the time.Plus, it's vulnerable to Lightning.
As a general rule, if it can hit you, it will hurt you; that's generally how Narutoverse combat works.This is true for even Pain.
That's why people either dodge or regen.
VOTE
[X] - My reliance on my bloodline
The Sharingan is a dead sexy bloodline. But because it's a bloodline, people come prepped for it. And in the more than forty years since the Uchiha have fought Konoha's wars, people will have come up with a LOT of counters.
Note how canon Zabuza used Hidden In The Mist to deprive Kakashi of the use of the Sharingan. Or how Deidara spent years training his sight to look through genjutsu. Or how Danzo disabled Shisui despite his having a Mangy Eye.
We aren't going to match Itachi or Tobi by simply going more Sharingan; they have decades of experience on us, and we'd be playing perpetual catchup if we try that route. We have to think a little laterally.
So more Speed. More Intelligence. Better Chakra Control. More holdout techniques that can't be disabled by a flashbang.