They might be further away financially than what battery manufacturers/suppliers/installers indicate. Battery prices haven’t decreased as forecast and they are likely to only become financially viable if grid electricity costs increase substantially. Currently they are only have a financial benefit if one is off grid and is looking to connect to the grid. The costs to connect to the grid, especially for non-urban residences, can be similar to or more than an off grid PV battery system. This is currently where home battery systems make sense.
Looking at new technologies like lithium ion, flow batteries etc, the other issue is reliability. Current testing indicates that there is some work to improve their reliability.
More about home battery systems, including reliability information, are discussed in this thread…
There is also thought that potentially massive grid based storage systems (battery farms, pumped and traditional hydro etc) make more sense financially for the community as a whole than individuals installing their own home batteries. This is due to economies of scale and that it is cheaper per unit of energy installed. These storages are also actively managed rather than set and forget like home battery systems.