Heh, if the robot only stays in rocket punch mode, how the hell can it use other attack? Again, it's a special mode of the Mazinger Z that it uses again a type of enemy. It doesn't have to be used all the time. But I'd rather have THAT mode than another Mazinger Blade, thank you, since that stuff belong to Great Mazinger, not Mazinger Z.
And the fact it forms up a HAND, not just a fist, it can close down and become a Rocket Punch or straighten out to be a Rocket Chop like you said, hell it can even pull out a Giant Iron Cutter, talk about variability.
I love Mazinger too thank you, and I don't give a damn if you like the new concept or not, it's just you and me debating SUPER ROBOT SCIENCE and WHY SUPER ROBOT ATTACK SHOULD MAKE SENSE in the first place.