Real electricity, with any sort of topology loops, quickly becomes a nightmare. I should show you some of my old homework problems.

Oh, heck, here goes. Lets say you have a cube; each edge is a resister of R ohms. Remember, current can flow in any direction, any loop. You have a voltage V applied at one corner, and a ground at the opposite corner. What is the voltage at corner X?

I could not solve it, and I was forehead slapping when I saw the trick that made it simple. But if you could not see the insight that made it dirt simple, the math of the loops is ... arrrggh. And no computer will be able to see that insight.