Comment by YetAnotherNick

So if you can just run without one service, what's stopping you to remove the dependency altogether. Why would you only want to remove the dependency when service is down.

So e.g. to get real my application depends on AWS's EC2, RDS, EKS, S3 Cloudflare's DNS, and Redis' instance. If any of those stop working it will go down. If everyone is within SLA, they might as well go down together than separately.