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No, this is just how languages generally work, how loanwords come to be, and how cultures influence each other.

You have a point, English proper lacks the semivocalic-i after a consonant (as /Cj/), except where followed by /uː/. So also "Bee-ORN" for Björn, and "MA-fee-uh" instead of Italian "MA-fya" for mafia.

What's interesting to me is that a "good enough" approximation of Japanese phonology is pretty easy for native English speakers to express. The issue is just they have to understand the really consistent syllable structure to parse it out of the romaji.