This, among other things, is why it was always delusional for the legacy carmakers to think they could “crush Tesla at a whim” and at a time of their choosing, as if a BEV was only a tiny tweak to their existing product design and manufacturing skills.
Of course, this never was the case, as the legacies are now discovering. First, they didn’t really try to pivot to BEVs until the horse had already bolted. Then, they discovered making good BEVs is much, much harder than they ever realised, and a whole suite of new skills are required that they didn’t have. And finally, because they didn’t have 10 years of learned experience under their belt making and optimising BEV design and production, their products were generally inferior to competitor products on important metrics, and they couldn’t make them at a profit.
It’s a textbook case of disruption of an established industry.