There's a lot of reasons. First, harm to low income families. For instance, _requiring_ that new homes have electric vehicle chargers in the garage does nothing to help immigrant families purchasing their first home is a similar proposal that doesn't nothing but increase harm to the environment and low income families. This is another one of those stupid laws that are designed to move ownernship out of the hands of the poor and keep it centralized to the rich.
Second, This sounds like way to funnel money to political donors.
Third, didn't PG&E just set half the state on fire? Is this really a good idea to load them up even more?
Finally, politicians need to focus on results, not specifying the means. Let the free market, actual scientists and engineers figure it out.