Takeoff power is not only needed at takeoff. It is needed at go-around (if the landing is not working out) or in emergencies (what do you think will happen when

Takeoff power is not only needed at takeoff. It is needed at go-around (if the landing is not working out) or in emergencies (what do you think will happen when 1/2 engines quits?) Catapults address one of those cases, and you die in the other two. No thanks.