> And the same batteries can easily be given a second life, after degrading too much for car use and before refurbishment/recycling to make them suitable for car use again, as fixed batteries.

This is the thing people tend to forget. Even if a battery is "useless" for an EV, meaning that it has degraded to 60-70%, it still has 25-50kWh of usable capacity as-is.

And that's enough to run a house for 12-48 hours depending on how power-hungry your appliances are.