The energy flowing through the batteries is the same despite the different battery brands and inverters. There's now APIs like Enode and others that have open standards for connecting dozens of EVs, batteries, HVAC equipment to react to grid events. Hopefully not too many DIYers out there but we're starting to see new models emerge where aggregators like Tesla, Sunrun, Currents, etc. (still needing PTO) can join the grid thanks to the APIs
This quasi public-private partnership only makes customers foot the bill. If utilities aren't willing to innovate, what can we do? We can add more distributed energy and go off-grid, but it creates this "death spiral" all the utilities talk about.
How about compensating homes for their generation when needed. Distributed energy that is co-located to demand, thus reducing T&D costs. This is the idea of VPPs and DERs. Obviously goes against what monopolistic IOUs want.