Tell me about a service that needs this reliability please. I cannot think of anything aside perhaps some financial transaction systems, which all have some fallback message queue.

Also, all large providers had outages of this kind as well. Hell, some of them are partially so slow that you could call it an outages as well.

Easy config misstep and your load balancer goes haywire because you introduced unnecessary complexity.

I did that because I needed a static outgoing IP on AWS. Not fun at all.