Kishi doesn't follow that, in NV instant means it travels to any location in 0.00s regardless of whether it's in another dimension or a few metres away.There is no such thing called instant, i suggest you read doreamon explaination on his traveler door.
Another bias assumption, there is no such thing called or stated in the manga about 0.00s. Instant to x location still required phasing though a short cut to the place. When things is not explained in detail, it will auto follow the common knowlegde of logic.Kishi doesn't follow that, in NV instant means it travels to any location in 0.00s regardless of whether it's in another dimension or a few metres away.
Naruto's shunshin is slower than Sasuke's S/t just have to accept it, Naruto still has to spend (x)amount of time to go from 0km/h to (x)km/h, Sasuke doesn't need to at all, he'll already be at another location before Naruto
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