Literally no one with any expertise says that energy storage is an unsolved problem. All do acknowledge that building out storage will be a project of a scale

Literally no one with any expertise says that energy storage is an unsolved problem. All do acknowledge that building out storage will be a project of a scale similar to that of building out renewables. Only the most dishonest would insist that the relatively small amount of storage already built demonstrates anything other than that capital is overwhelmingly better used, today, to build out new generating capacity. It would be obviously stupid to spend on building storage you have not generating capacity to charge up.