I see these things as a waste of time and resources. We already have all sorts of ways of storing energy, from chemical to mechanical to biological, which are k

I see these things as a waste of time and resources. We already have all sorts of ways of storing energy, from chemical to mechanical to biological, which are known to work. There are myriad open questions regarding the practicalities of incorporating a battery as the frame of your house, and given the "technological inertia" of the building sector and its regulations, it would take several decades before we even start experimenting with this in real houses. Meanwhile, the world burns and we increase our energy consumption. Again, a waste of time and resources.