Your operational reviews must be lacking at AWS then (surprise surprise) then because there are so many instances where something will be released in alpha yet the documentation will still be outdated, stale and incorrect LOL.
I think you misunderstand what's being talked about in this thread. "Operations" in this context has nothing to do with external-facing documentation, and instead refers to the resilience of the service and ensuring it doesn't for example, stop working when a single data center experiences a power outage.
"It stopped working because you did XYZ which you shouldn't have done despite it not being documented as something you shouldn't do" isn't different to a customer than a data center going down. For example, I'm sure the EKS UI was really resilient which meant little when random nodes dropped from a cluster due to the utter crap code in the official CNI network driver. My point wasn't that every cloud provider released alpha level software by the same definition but that by a customer's definition they all released alpha level software and label it GA.