i just wanna get my 2 cents in here, i believe AC's can be real in the sense of something like AC5 where the mech is much smaller or stray away from it being an AC unit but instead a mech suit but after reading everything i do not see it becoming a combat type mech maybe a rescue mech when a building collapses or something along those lines but the biggest issues for it ever be possiable which has been pointed out, the energy supply, as far as i'm aware we haven't come up with anything like we seen in AC where the generator keeps supplying power to an near infinite amount and also the balance which is why i said something like AC5 or a mech suit the smaller mass would make it easier to keep its balance and do much less damage should it ever fall over thanks for reading my 2 cents and have a good day