an English-teaching mother who said in no uncertain terms that an indefinite third party** should be specified with "he" or "she," starting at a pretty young age
Tell her to read Chaucer & Shakespeare, sorry a pedant* [origin 16th century word for teacher] often likes to make up extra rules, maybe it is just to bolster their ego.
Not specifying a gender does make something an it. eg
Before an employee will be considered for promotion they will have to pass a fitness test.
The locum has reviewed your results and they have prescribed an antibiotic.
The chair has read the minutes and they are not happy.
They can be used anytime gender is not an issue, which is like 97% of what we do.
None of this is said to chide, my purpose is to inform and promote discussion.
*it appears to have been 16th century jobsworth teacher who just decided to make this shit up.
**indefinite pronouns one, someone, anyone, etc.; and others) do not make male–female gender distinctions, that is, they are gender-neutral. The only distinction made is between personal and non-personal reference (someone vs. something, who vs. what, etc.).