Not great for people hooked up to home medical equipment
https://www.ukpowernetworks.co.uk/power-cut/priority-service...
Sometimes there are things the utility companies can do to help those who legitimately need to be prioritised, but only if they know who those people are.
After a blackout, I went looking for a UPS. The problem was the alarm. For all the models in the store, I wasn't sure if I could keep the alarm silent, or if the model had an alarm at all.
I never bought a UPS. (I had surgery about 18 months later, and turned in my CPAP.)