He would have been blind ages ago, if Sasuke and Itachi had Senju DNA they could spam Enton and Tsukuyomi all they want without going blind, thus making their attacks just as effective as Kamui was. Thank goodness they didn't.
He would be dead without Hashiroids.
Hashiroids make up a significant part of his body ya' know...
Sasuke does have Senju DNA...Kabuto healed him with Harashima's cells.
Not really, Obito's Hashirama's cells were not potent, meaning they were inferior compared to Madara's
Only benefit Obito got was faster healing and cqc wood style
Same exact strength.
You don't think he'd be a little blind? He's been spamming Kamui since 14. Kakashi was already going blind and he didn't start using Kamui until much later, and to a much lesser extent.