Gee I think we've said that already.
But the question is why not hit a backhand instead of hitting an inside-out forehand IF your backhand is your stronger side. Now suppose you hit an inside-outside forehand to your opponent's backhand, which is his stronger side evidently, and he then rips his backhand DTL. Then just to be safe he can follow towards the net for a putaway volley. Not so risky for that player then, yes its a lower percentage shot, but better than hitting right to your opponent.
All assuming that your opponent has a stronger backhand than forehand. Back to the original question, why hit an inside-out forehand instead of a backhand if your backhand is the stronger side? ;
Confidence is a theory.