A large ammount of fuel is used overcoming the force of gravity before a device can even lift off the ground, much less reach full acceleration.
By launching MS out on a Catapault, They are saving a VERY LARGE amount of fuel, thus allowing the MS to stay in the fight longer without worrying about running out of fuel for thrusters and manuvering.
because even on earth, MS do use their thrusters to assist in manuvers.
Its the same in space, altho to a lesser extend, expending a large amount of fuel to overcome the MS's mass and move it forward.
I think the catapault is just a method to save a large ammount of fuel.
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