That makes more sense. But capacitors are limited in the amount of energy can store by their physical size. I used to know the formula to calculate the capacitance given a number of dimensions, but that is long forgotten.
For capacitors it is all about plate surface area and distance between electrodes (the thickness of the dielectric between the electrodes). I think the limits are primarily due to materials and methods to maximize surface area.
Your formula would have to be updated to reflect the advances in nano chemistry.