Let's also not forget that Yata is ethereal/metaphysical; it possesses no physical form [
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]. It's literally just there to deflect anything that comes near it - it cannot be destroyed because it is not physical. This is the same case with Totsuka, which possesses no physical form. So Totsuka and Yata are basically always in a comparable state to the Susano's ethereal state, which can phase through anything (wouldn't happen to Yata for obvious reasons) [
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][
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][
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]. People need to understand the difference between spiritual items and regular jutsu. A mini-TBB was reflected with a Gunbai as River pointed out without any troubles at all. And that Gunbai had physical form, nor was it a spiritual item (nor comparable). The Yata Mirror is not only metaphysical but it also changes its traits to repel any attack, meaning despite its power, its getting repelled because it can't bypass the metaphysical defence that is reinforcing a v4 Susano. People make it seem like v4 Susano needs an armour that is weaker then itself, which makes literally no sense. Especially when that armor is a
spiritual item. Its tremendous hype, its feats and the 'hyperboles' being
continuously restated leads me to believe that it does in fact do what is suggested.