> If your company is in anything finance-adjacent or critical infrastructure then you need to be able to cope with a single region of AWS failing
That still fits in with "almost guarantee". It's not as though it's true for everyone, e.g. people who might trigger DR after 10 minutes of downtime, and have it up and running within 30 more minutes.
But it is true for almost everyone, as most people will trigger it after 30 minutes or more, which, plus the time to execute DR, is often going to be far less than the AWS resolution time.
Best of all would be just multi-everything services from the start, and us-east-1 is just another node, but that's expensive and tricky with state.