They aren't trying to solve the problem of 'doing it the best way'. They're trying to solve the problem of 'what else can we do with these high performance bat

They aren't trying to solve the problem of 'doing it the best way'. They're trying to solve the problem of 'what else can we do with these high performance batteries'. So they have some where else to put overproduction, have more buying power of raw resources due to scale, more research dollars to put into li-ion batteries responsibly, or they already have the well made hammer of li-ion batteries so everything is a nail.