How isn't from a practicality point of view?
Because it ignores the asymmetry, and relative faction power. It just picks two vehicles in the same 'class' calls them equal, and then calls unequal costs imbalanced.
If I wanted to engage in the same type of argument I could just as easily cry for massive nerfs to KV-1, t34/85, and all the premium shermans since panther is so much more expensive.
I don't spam threads with this though because I don't want to actually rot peoples brains. I just want to stop reading the same awful arguments over and over.