Only "on" in French is specifically for persons whereas "it" is for things and not persons. It is properly considered derogatory to refer to a person as a thing

Only "on" in French is specifically for persons whereas "it" is for things and not persons. It is properly considered derogatory to refer to a person as a thing - hardly a quirk. "On" is also non-specific and can't stand in for he or her. The advantage or quirk in French is the singular possessive pronouns follow the gender of the thing possessed not the possessor. Edit: to clarify, my objection is that "on" is not an example of a gender-neutral all-purpose or sentience-neutral pronoun. Not having one of these is hardly a quirk (just a pita).