> Sure, but that's not a remotely accurate description of a house without a backup battery or generator.
I don't mean it as one. Resiliency is my end goal, and "a reasonable amount" at that, not "I can reboot civilization from the zombie hordes with just what is in my shed". If you are already resilient with just a house and what it will naturally do without power, hey, great. A battery opens up options, but if it is not worth it, it isn't worth it.
It should be a social expectation that you can survive a reasonable 2-3 days without power and whatever other service outage you have without having to immediately hit the stores or drawing on emergency services. I do not care exactly how you achieve that. I don't care if you're carrying on like nothing happened in a well-lit house with AC on full blast or if you're eating beans out of a can and drinking bottled water. I just care that people should be expected to be at least a little resilient, for all sorts of pro-social reasons, that if you have your additional needs like an oxygen machine or necessary medicine that you have the buffer in place, and so on. (Which does imply certain perscription practices keeping you on a short leash are in violation of this, but that's another discussion.)