The file helper has a fair few things in it, but path helper only has set_real_path and directory helper only has directory_map in it. Having said that I guess there is good reason to have them in different helpers though, just for naming clarity.
So although I can see why, if you are combining and then expanding the helpers, then why rewrite them all if FlySystem does that and so much more.
I wonder what the results of the poll would have been if there had been a third option, perhaps a 'whatever you think is best is fine by me', or a more simple "Don't know, not sure or don't care". Just a Yes, No is rather polarizing.
Best wishes,
Paul.