The problem is that often enough official translations are not necessarily made by good, well paid translators. So we're not translating amateur translator to real translators but amateur passionate translators to cut-rate translators.
As an aside, as someone who complimented his studies of Japanese by watching dramas and anime before eventually living in Japan for years and becoming fluent. I can say that the amateur fan translations were very often much better.
It would really surprise me if it were the case. Being a good translator requires years of studying and it’s not just a matter of knowing a foreign language. An anime nerd may occasionally find a slightly better way of translating a Japanese word into English (and quite often it would be better only for other anime nerds and not for the general public), but it be would really surprising if randos were better translators than real translators.