Comment by zie

VMS systems give you literal decades of uptime. Google, Amazon and other large providers regularly have outages, all the time. They are usually small in duration and localized.

They are completely different mental models and ways of thinking about the problem of reliability and uptime.

VMS(and IBM/360 and other large compute systems) will almost certainly give you stronger uptime guarantees than any modern compute stack, but almost nobody needs uptimes measured in literal decades.

The Hyperscaler/TOP500 computing needs are not optimized for reliability in the same ways OpenVMS does.