Absolutely true that and fortunately that situation appears to be in the level of risk as tankless water heaters lighting your house on fire. But only time will tell.

On the plus side, you can put them in a subterranean vault if you have space on the property for the set back limits.

Or you can get home batteries LiFePO4 chemistry. Better lifetime/more cycles, requires temps about 100C higher than NMC chemistry to hit thermal runaway, and better temperature ranges. The only problem is that it's not as power dense as NMC batteries but that's not a huge concern for a home battery.

True, and we're watching over vendors in this space (we use LiFePO4 batteries in our camper) the integration with the Powerwalls however is pretty good. Batteries being only one component of the whole off grid experience.