I think this outage, however it affected anybody, just highlights how completely garbage HomeKit is in so many ways, the main one being reliability. For stuff around the house, it should not need to keep calling Apple. Of course it has to upload camera recordings and it's status but it should not be affected in the home when there is an issue with Apple's backend systems in my opinion.
I should still be able to ask for temperature readings, close curtains et cetera whether there is an Internet connection or not, and whether there is an issue at Apple HQ or not.