If it's faster to say, maybe--when I call for a policeman or a fireman, it's understood that a female police officer or an EMT Firefighter is just as good, but in a firefight or a fire, maybe that's too long.
Otherwise, it may be too obscure for the general populace: what's the gender neutral of "fisherman"? It's "Angler". I learned that--just three years ago--from a cooking show. "Waitron" has yet to enter common use, for another.
Maybe it's because they aren't interchangeable: actors and actresses *can't* fill the same roles, not really.
To answer the Landlord/lady question, it *is* faster, *and* everyone knows what you mean.
Otherwise, it may be too obscure for the general populace: what's the gender neutral of "fisherman"? It's "Angler". I learned that--just three years ago--from a cooking show. "Waitron" has yet to enter common use, for another.
Maybe it's because they aren't interchangeable: actors and actresses *can't* fill the same roles, not really.
To answer the Landlord/lady question, it *is* faster, *and* everyone knows what you mean.