On the other hand in HOI3 if you have 1 infantry and 4 artillery in a division you have a "frontage" of 1 compared to a mostly normal division (say 3 infantry and 1 artillery) of 3 and I am not sure a 1 frontage division would last very long vs a 3 frontage division given how the combat simulator works (I have not done the experiment however).
It doesn't have to last long on it's own since it has superior attack values and since you can easilly fit 2-3 times as many in key battles grinding down the enemy divisions before you even lost half org ( all else equal ).
On very spead out fronts though or 1vs1 infantry was superior in HoI3, so this was a quite reasonable balance.