No. I simply chose a single point that you were wrong on out of *many* as a single example because I’d be throwing a wall of text up if I were to explain every point you were wrong on and why in depth. A lot of the electronic, not the electrics, on a modern car actually does operate on that nominal 12V and does not rely on the PCM/ECU for voltage regulation.
To choose another single point of the many, Limp Home mode is actually not for ‘security’ but for safety reasons.
I build EFI/engine management systems for fun, profit and racing.
I repeat what others inform me of and they may not inform completely because I stop them after I get enough to get a sense of a larger persective. They may know much more than you and I suspect they do. But I’m not interested in detail. I’m interested in motive and intent.
Whether you build for whatever reason, you are still missing the bigger picture.
That should concern you.
I still think you are interested in self-affirming your ego value rather than get to the root of what this thread is calling out.
Try expanding your thinking.