If heavies and super heavies are to cost effective because they own medium tanks, who not make medium tanks harder to own? Not to mention tanks not dying to a passing breeze would help lengthen games a bit.
i think i am correct in assuming that before WFA, most people appreciated early game flow and mid game flow where medium tanks has to find holes and have to play little dances against enemy medium armours and other things.
then late game comes with these heavy armours that have guns that shoots nuclear bombs and armour values that warps gravity.