Its a bit tangential, but I would love to know what the core skill sets of some of these engineers were and why they were so valuable. I understand battery che

Its a bit tangential, but I would love to know what the core skill sets of some of these engineers were and why they were so valuable. I understand battery chemistry and all of the subtleties associated with them warranting poaching/hiring away/etc., but fundamentally electric vehicles are pretty simple. I am sure there is a bit of 'I don't know what I don't know but at the same time, I have built an electric go cart, and solar powered car in middle school and high school respectively. And that was spec'ing parts, selecting system voltages, wiring design, battery configuration, mechanical selection, chassis design, and physical construction. I would imagine one could hire good engineers from SAE challenges out of the universities quite easily and its just hard to understand where the killer skill set is. Perhaps it is understanding the supplier ecosystem, institutional knowledge to testing and regulatory rigour? Maybe its industrial design talent? Or maybe that within a 1 hour radius of Apple is a limitted supply of non-strictly-software engineers? I would love a bit more insight than the article provided and I am sure someone on HN has a bit of an inside perspective?