Perhaps someone (ya live in a cave, do ya???) doesn't know what "bcc" means. It's "blind carbon copy" and many years ago in the age of real ink and paper messaging, one would put "bcc" and a name or two at the bottom of the master (kept) copy. A clean message would go to each individual without the others knowing anyone else had received it. In today's world, it also means you aren't sharing everyone else's email address with the world!
So, if you aren't using the "bcc" function...DO!!!! It doesn't take one single keystroke more than the other way.