WHY THIS DIDN'T ALREADY EXIST

None of the physics in these guides is new. Adiabatic conductor heating has been standardised in power engineering for decades — it is how short-circuit ratings are calculated for cable. Permeance-coefficient demagnetisation is routine in motor design. Sizing a DC bus by ripple current and ESR is ordinary drive engineering.

What had never happened is anyone pointing it at a two second RC pass. The people who know these methods have never built a drag car. The people racing them have never had a reason to open a cable standard. The overlap was empty, so the questions got answered with opinion instead of arithmetic.

That is the whole explanation. Not that it was difficult — that nobody had stood in both places long enough to do it. Every number here can be checked. The formulas are standard, the assumptions are labelled, and where something is an estimate it says so. Check it yourself, or hand it to someone who can.