I'm guessing it's mostly people with deep specialization (and interest) in combustion drive trains (e.g., engineers). I don't think it's feasible to take a comb

I'm guessing it's mostly people with deep specialization (and interest) in combustion drive trains (e.g., engineers). I don't think it's feasible to take a combustion drive train engineer with a decade of experience and make them reasonably productive as a battery engineer in a short timeframe. No doubt many of those engineers are capable of making the pivot, but most are likely not particularly interested.