What's not relevant is your opinion unsupported by any actual facts.
I think this analogy should clear it up even for you:
1. Sasuke opts to use Amaterasu on Kaguya [
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]
2. Kaguya clearly notices it beforehand [
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], but does not evade it, and instead lets herself get hit, easily absorbing it afterwords [
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]
3. Kakashi prepares to attack Kaguya [
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4. Kaguya clearly notices him beforehand [
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], but does not evade it and only groans from pain [
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], realizing that she could not absorb the Kamui Raikiri.
To make it even simpler, to say Kakashi blitzed Kaguya would also be saying she cannot avoid Amaterasu. I'm not even using the Sakura argument here, though it's still valid.