I get tired of the snipes from people that "well, you're doing it wrong", as if this is trivial stuff. But if Amazon themselves aren't even making their AWS console redundant between locations, how easy/straightforward is it for anyone else?
To what extent is this just "the cobbler's kids have no shoes?"
We're not talking about a leap in order of magnitude of complexity here—just simple management of common human behavioral tendencies in order to promote more reliability. "The problem is inherently complex" is always true and will always be true, but it's no excuse for not designing a system to gracefully handle that complexity.
You're close. Put another way, "inherent complexity is the problem."
What I mean by that is, the more your system is coupled, the more it is brittle.
Frankly, this is AWS's issue. It is too coupled: RDS relies on EBS, the console relies on both, etc. Any connection between two systems is a POF and must be architected to let those systems operate w/o that connection. This is why SMTP works the way it does. Real time service delivery isn't the problem, but counting on it is.
Uncouple all the things!