You can still move forward into the ball with an open stance. You don't need a closed stance to move into the court and penetrate the ball. Righties, put all your weight on your right foot and accentuate the foot stomp. No one really just runs side to side anyway, baseliners, out of simple geometry, must move forward in order to get to wide balls.
Uthree, there's a difference between hitting off the back foot and hitting with an open stance. Besides, what works for you isn't a be all end all for everyone else. Hitting with a closed stance is not an act of desperation. It is a way to hit the crap out of the ball when you have time to set up.