Background on the service: https://aws.amazon.com/builders-library/reliability-and-cons...

And all your dependencies are co-located.

Aren't you deployed in multiple regions?

Totally ridiculous that AWS wouldn't by default make it multi-region and warn you heavily that your multi-region service is tied to a single region for identity.

The usability of AWS is so poor.

That wouldn't have even caught that, most likely unless they verified they had no incidental tie ins with us-east-1.