Your statement only makes sense if you have the strange assumption that something that is a good solution for an isolated island is also a good solution for eve

Your statement only makes sense if you have the strange assumption that something that is a good solution for an isolated island is also a good solution for everybody else. On large continental grids you can do a lot of things to reduce the need for battery storage, e.g. transporting power over distances, demand side management in large factories and using other terrain-dependent storage technologies like pumped water storage.