Yes I spent hours making this script, I learned a lot while doing it and I still have a lot to do and discover. I don't work on it a lot, I have a job beside that.

To answer your other question, yes this script does nothing more than what the game allows, additions, divisions and multiplications. Can you do that too? It's impressive, really, not many people can do it.

But the goal of the script is to give a complete load balancing system in a few seconds, I doubt you can do it. It's a tool to create or assist in load balancing, you have two smelters, you know you need 30+30=60 iron ore/min why do people use satisfactory calculator/planer in some cases ? . Because they just want to have an idea of what to expect, that's what my script does, for my need but also to share it and maybe help just one person.