Cross-region backup isn't here to solve for meteor strikes and nuclear war. Most of the major AWS disruptions have been contained within a region. If you're unlucky enough to depend on one, your service is down and you don't know when it will be back up.
If you document and drill an cross-region recovery, in *most* (not all) cases you will be able to more confidently predict when things are going to be running, you'll know what information is there and what isn't and can build processes to communicate expectations to customers and/or regulators.
If you document and drill an cross-region recovery, in *most* (not all) cases you will be able to more confidently predict when things are going to be running, you'll know what information is there and what isn't and can build processes to communicate expectations to customers and/or regulators.