Several centuries of linguistic evolution would disagree. Those have always been neutral, though there has been usage of singular "they" dating back to Shakespe

Several centuries of linguistic evolution would disagree. Those have always been neutral, though there has been usage of singular "they" dating back to Shakespearean-era. It is somewhat widely accepted that he/him/his is only gender-neutral in situations where the gender is ambiguous though. For example, in writing documentation. Personally, I think it sounds weird and prefer they/one.