Which is what I have been stating, Intangibility is dependent on his Reaction Rate, which would explain why he got hit a number of times - Amaterasu, Rasangan, Danzo's guard that poisoned his arm. In short, Intangibility is directly proportional to his reaction rate - he decides to go through, so he does, it's simple. He couldn't for Amaterasu, which means he couldn't activate it fast enough. Since Intangibility is dependent on his reaction rate, so is its activation speed. It isn't independent of Obito's Reaction Rate.
Don't misinterpreting what I'm saying. Kamui can be activated or deactivated. During kamui's activation obito has 5 minutes of pure intangibility before he has to deactivate it & start over, this is how konan figured out his weakness. Its been stated multiple times that obito needs to be taken out with a volley of attacks that last more than 5 minutes, this is the only way that intangibility can be countered, because while intangibility is activated nothing can harm him.
Kamui is not dependent on reaction rate at all actually. Obito failed to activate his 5 mins of intangibility before sasuke hit him, that's why he got hit, intangibility was not yet activated.
I am still not buying this on and off thing as all Ninjas posses basic sensory perception. Once he senses something, he reacts using Intangibility. To tell you the truth this on and off is simply Obito Solidifying and Phasing through. I don't see anything automatic about it. When he chooses not to be solid, he is using Intangibility and that alone completely hinges upon his Reaction Rate, which are pretty damn fast, as don't think I am undermining the guy. I mean, it's the same guy that intercepted KCM Naruto with Gunbai and bashed it in his face. Lol If that ain't fast then I don't know what is, because Obito wasn't even moving.
This cannot be true, obito has phased through attacks that he's not even aware of, this proves that kamui is not based on reactions & that it must have an "on/off" switch, otherwise what you said doesnt make sense.
Obito can only phase through things he can react to? Well then how did he react to attacks he didnt even know existed until he almost got hit by them?
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Some proof that intangibility is automatic due to obito phasing through attacks that he didnt know were coming.