"volume grows quicker that surface area" always translates to limiting the amount of surface area something can have
except,, hey the volume dictates the water displacement which dictates the buoyancy and wow suddenly you get to a dynamic where a squared increase in weight from increase surface area is negated by a cubed increase in water displacement and yeah that's why people started making Big Fucking Boats lol it's an inversion of such a core restriction that almost everything else faces
So what I'm hearing is the next mecha should be about watertight craft floating like icebergs around an oceanic planet to fight each other.
Mech pilot who walked the plank that one time and always gets teased for it