Okay, so I'm tired and not with it, but you're getting way to up yourself. The Yata Mirror is part of the same set as Totsuka no Tsurugi anyway (Mikusa no Kandadara).
And just FYI, Itachi is one of my favourite characters so you're pretty awful at 'weeding out haters'. It's just fanboys who glue themselves to the unreliable databook and Zetsu's opinion to back up what they think.
That doesn't mean they act the exact same way.
Kishimoto gives information on people and jutsu through others. What, you want to debunk all of madara's history too? Beecause madara's history came from itachi, hashirama, and obito...
Kishimoto even tried to prove zetsu's opinion in the short timespan he had.
He repelled Hydra. Yata > Summonings.
He repelled sasuke. Yata > People.
He repelled Kinetic force. Yata > Explosions (tbb explosion, C3 Explosions, etc.)
He repelled Metal. Yata > Matter (trees, knives, etc)
He repelled Fire. Yata > Elements.
The only think he didn't repel? Genjutsu. Because genjutsu is less of an attack and more of messing with someone's senses.
Yata's hype was proven in one manga page, people just don't want to accept it and just want to try to overpower it.
quintuple rashoumon gates redirected a TBB, therefore a tbb can be redirected, therefore yata will repel it into a bush somewhere to explode.
Gaara's Sand Blocked a C3 explosion, therefore yata repels it.
Haters/non-believers always try to 'break' yata, when it was never once stated it tanks attacks. It can't be broken if it's not tanking shit. The shield repels around itself and the user before the even hit.
the only possible thing i could think that would overpower it would be Omnyoudon(creation of all things). Other than that, you need to get between the user and yata, or use genjutsu. with itachi being an uchiha with a susano'o up, that makes the chances of those 2 happening negligible at best.
Simply because Yata mirror isn't a Jutsu and kamui is doesn't mean anything.
It doesn't need to be Ninjutsu in order to be warped.
It means alot. It means they're not held by the same logic and standards. Furthermore, how would kamui warp it? Obito's kamui, firstly, couldn't warp it because he'd never get within range to touch it (yata repels people).
kakashi's kamui most likely won't warp it because the dimension rift would properly be forced to materialize infront of the shield and therefore have no effect. kakashi's kamui is somewhat debateable but obito's isn't.