[zie]

You are talking about hosted k8s, which is not what I'm talking about. If you have never worked on a on-prem k8s team, you are totally missing out! :)

k8s is brittle, all the other competing tools are also fairly brittle, so it's not like k8s is really alone here. This is why we keep replacing the newest mess of virtualization every once in a while, someone eventually gets fed up with whatever the current crap is and writes a new one. It becomes popular, breaks in new and unique ways, rinse and repeat.

k8s is not even a decade old at this point. Mainframes have been around with 5+ 9's of reliability for 6+ decades.

I'm not overselling what mainframes provide. I think you just have selective memory.

99.99% is not what Mainframes provide, they provide many more 9's than that think 7+.

Most of us don't even need 99.99% uptime, so most of us probably shouldn't be buying mainframes. If you DO need severe uptimes, then you either have a huge oversubscription and dedicated teams of people around the clock babysitting things or you buy into mainframes. You absolutely don't buy AWS or Google Cloud or Azure and say, that's good enough, because their uptimes are just marketing speak, not reality.