This may be because I am French and we do not "reuse" pronouns (in the sense that "their" always refers to a group). I know however that "their" use in single form has a long history in English and I therefore try to use "their" like you most of the time when it helps to generalize.

We have new constructs in French such as iel (il + elle = he + she) which is used by some and by others not (and forbidden (or very strongly discouraged, I do not remember) in national education). I do not know if this is good or bad, it has the advantage to address males and females as a group (it is otherwise "he" or "hes" (plural of "he")).