I think it's because commando are cc units wipe machine while falls are "supposed" to be long mid range units cause they lose even to ppsh cons rushing them while in green cover, they should excel in something be close mid or long range, but they can't even beat RM
They excel at infiltration. Using them from hidden position with bundle nade or blendkorpfer is a good way of wiping squads, as their all range guns are really good at finishing weak models. They can also use camo to flank the enemy as he positions his troops along directional cover to repel volk blob.
In defence they are just as good as an lmg squad which is quite well considering their abilities. They are never ment for long outslaughts or frontal attacks. They also are not a good blob material. And that is exactly what we expect from them in a ballanced form.
Here was a tommies and rifles, which you will have in most of all game agains UKF and USF. And problem are in, which a basic infantry squad can become stronger than elite infantery.
I know what commandos have more cost and need ammo for brens, but if need be they can pick brens and annihilate enemies on every range, while falls cant do nothing to be stronger.
Falls have better choice of granades than commandos, better profile of base weapon and AT capabilities. Is that really that little? Mind that base cost of falls is 360 (without the infiltration fee) and they even get 10% discount on reinforce.
But I actually agree that infiltration commandos got buffed too much in DBP.