Proper solution is to pool them in a dedicated buildings so you still get the benefit of locality at the neighborhood level while containing the consequences of a failure and limiting them to property damage (vs potential loss of life), but that would use up land that can otherwise be used as a way to (literally) seek rent, so it cannot happen.
yes, although they are statistically much safer than fridges, or combined washer driers. (unless you include cheap e-bikes or hoverboards...)
I don't have mine inside the house, its very much outside with a wooden lintel supporting a surprisingly sandy flower trough.
I also have micro inverters, because they are more efficient, and less fucking noisy. They are also, as you hint at, much safer. Partly because they are not switching ~400v DC but also because they don't need to handle as much power.
over the last three months, I've been paying on average 16p a unit. Thats with a car as well. On the days in the winter when solar isn't doing shit, we top up at the lowest price that day.
This kinda goes to the articles point which is to you can avoid, or limit the peak with local storage.
The issue with the battery is that its costs a shit tonne. a basic battery is going to cost something like £8k installed.
Its almost certainly cheaper to upgrade the grid compared to adding batteries to a million households. Especially as the lifespan of batteries isn't that long compared to the super grid.