That’s an interesting question.
Your assumption that electrical storms will “kill most cpus/ecus" is completely false.
There are millions of vehicles that are ECU controlled that are exposed to the most severe weather and climate conditions and don’t fail or are “killed”.
There are speculations and assumptions made about an EMP from a nuclear bomb blast that predict the destruction of electrical circuits. But scientists make hypothetical predictions all the time, often to be proven false later.
Can you eliminate the ECU in a carb’d engine…. Of course.
There may be a number of reasons “why” you would want “delete" the ECU in our Toyota engines, but I can’t think of a practical reason based upon most of the applications of the 4x4 wheeling community.