if it costs around the same energy to nullify the effect of mass on inertia as it costs to move the mass using ballistic or aerodynamic lift techniques, then why would you propell these heavy things to be able to smash into stuff if you could just nullify the mass and allow the objects to move with less ballistic impulse forces (ballistic and torque, to include wheels, but why use wheels if you can artificially reduce the weight and thus cost of aerial motion?)