Necessary as it is at times, I hate this word. For one thing, "ones" is a plural form of the number 1. That is dumb, and it's reason enough to avoid it where it isn't entirely necessary.
One could argue that it never is necessary, but it can still come up in colloquial dialogue when discussing objects. JW leaders use it to discuss people.
Interestingly, JWs even did this to Jesus Christ in their own translation of the Bible, referring to him in Ephesians 1:7 with "through the blood of that one" where another translation would say something like "through his blood". Why do they insist upon the neuter object reference?
I don't like it. It's tied too closely with cult indoctrination for me. The word takes all the soul and personality and individuality away in favor of identifying every person as what is truly the loneliest number.