I guess none of us really needs those 9s, and even two 9s are just good enough. I even doubt whether *SOME* of the banking transactions really really really need those 9s too -- like, I don't really mind if 1 out of 100 credit payment doesn't go through so I have to do it again -- it does happen once for a while and I just swiped it again.
I had an ATM glitch out on me a few months ago, I tried again and it confiscated my card. I called, and they explained that it is the failure mode to prevent people modifying them while they're offline.
Retry is fine, but imagine being unable to pay for something within 10 minutes in month. And 10m in 1M is 99.98% sla. So it depends
GitHub has a container registry. That going down can cause pod start failure. I agree the source code probably doesn't need infinite nines, but the container registry is different.