Yes, I agree in the long run. But say you took are poised to take London, but haven’t taken it, and you run a calculation, it wouldn’t account for the future allied loss of capital, IPCs, and whatnot. The calculator also would think Germany was at a disadvantage because they haven’t expanded towards the east and gotten those IPCs, but in reality they have a large unrealized investment towards the west.
I think it would be cool to add certain things into the mix, like 1 or 0 values that the person can input, such as is London at significant risk of falling, same with all other capitals and important strategic territories. This reduces the simplicity but adds accuracy if you’re running the calculation towards the begging of the game.