We know that many Altmen can become bigger and smaller, but have you found that although they can become bigger, they become the biggest, that is, as usual? It can be said that Altman can't be infinitely long, just because he can grow bigger after shrinking, that is, he can change back to his original appearance, so Altman can't fight with his growing ability. Altman didn't come to the earth to play, they wanted to save the earth. When they fight monsters in an ordinary way, they will do great damage to cities or forests. Moreover, such injuries are inevitable. We can think about it. Altman is so old that he can still do so much damage. What if it's bigger? Isn't it amazing? If Altman becomes very big and fights with monsters, Altman may do more damage than monsters. So even if Altman has unlimited growth ability, he will avoid using it.
Finally, if Altman crushes monsters with the ability to get bigger and smaller in every episode, will anyone watch this film? If Altman becomes very big, it's about fighting monsters. We can bear it, but monsters can't. The monster worked hard to come to the earth, and was killed by a fan before jumping a few times. After that, what monsters will come to the earth, and we won't watch Altman's movies in the future.