Comment by otterley

1. AWS has no cross-regional or cross-zonal data plane[1] dependencies. Customers might couple them, in violation of best practices, but AWS itself does not. It's strictly forbidden.

2. That article you linked to does not support your claim. That is a report of a single-zone incident impacting us-east-1 only. Five other AZs in the same region were still fully operational.

[1] These are not the same as control plane dependencies: you might not be able to make certain mutations, but everything should still work in the steady state.