Would also require an isolation switch to be effective. With a grid-tied solar install it's going to dump all of the energy into the grid, and during a power outage that energy will simply not be collected.

I could see that becoming a thing where during a power outage you flip a switch near the electrical panel and then every green-colored outlet will run entirely off the solar panels when the sunlight is available. Or if we really want to make it technical solution, create special outlets that are dual power (grid and direct from solar) and then appliances plugged into these special outlets will switch between power sources as they're available. Potentially some issues with two different AC circuits touching depending on how it's implemented on the appliance side, but it could be a good solution especially if the controller can still backfeed excess energy production back into the grid