Board Thread:Theories and Speculation/@comment-31611719-20170514123545/@comment-734582-20170514124640

Most of these jutsu became obsolete one way or another.

Madara directly tanked an Eight Gates attack and survived. Yet we've seen attacks that can break a Susanoo below that power levels.

As shown with Pain, the absorption of chakra takes time. We don't know the exact properties of Kinshiki's weapons, yet it's likely that Sasuke didn't want to find out if he could absorb them before these weapons hit him.

Logically, the ability to absorb chakra is linked to one's chakra reserves (e.g. Toneri's case). Naruto had considerably greater power than Sasuke, so trying to absorb ninjutsu may prove fatal.

Lastly, there may be some evidence that there are hidden limitations to the Rinnegan that were never really explored in depth. Nagato couldn't spam his Deva path for instance, but it could also be that Madara's use of limbo or Sasuke's amenotejikara put their other abilities on cooldown as well.