Um... But that defeats the point of getting out of the saddle.

In the saddle the force you can apply to the pedals is limited by your body weight. Beginner cyclists might find it difficult to apply full body weight to the pedal (i.e. make their butt to lift off the saddle) whilst riding in-the-saddle, but with training it soon becomes possible. At which point the body weight becomes the limiting factor.

The whole purpose of out-of-the-saddle position is to overcome that limit: to use your hands to pull against the handlebars and thus apply greater than your body weight force to the pedals. The whole purpose is to push much harder.