If Fed/ACH going down for a few hours bothers you a lot but electricity/mobile network reliability doesn't faze you, you must be living in a truly unique place.
I personally have fiber, cable, and LTE feeding my home gateway. This might seem like overkill to non-tech folks, but I recommend it to anyone whose productivity/career is highly reliant on being online.
I realize this isn’t necessarily a typical home setup, but I also think most people are horribly unprepared for many potential situations.
This isn’t a claim that I have zero downtime at home. It’s only to say that if my Bitcoin node is offline then any hope of relying on fiat banking was abandoned much earlier.
Even if I had a setup like yours, I'd give up on bitcoin before "fiat banking." You can't buy gas for your generator with bitcoin.