>maybe if someone suggested that they don't need test environments and can just deploy changes to prod without testing or CI/CD and just see what happens That'

>maybe if someone suggested that they don't need test environments and can just deploy changes to prod without testing or CI/CD and just see what happens That's actually not hard, you need to be able to run in dry mode, and run the same in an existing instance (in parallel), then compare the results. If you are happy you can continue with the roll up, disabling the dry mode.