In my experience staging environments only work in a few (very common) use cases. When I do big data work I certainly use a test environment but we can't just r

In my experience staging environments only work in a few (very common) use cases. When I do big data work I certainly use a test environment but we can't just replicate all the data in two clusters because that would be absurdly expensive - and this makes testing performance basically only possible in prod. I'm sure basically any database system with a non-trivial amount of data has the exact same issue. But staging definitely works for something like a web server