It is possible. But you need infrastructure and paying delicate attention to this problem. It is hard to define exactly what does replicating prod mean. And so

It is possible. But you need infrastructure and paying delicate attention to this problem. It is hard to define exactly what does replicating prod mean. And sometimes it might be difficult, e.g. prod might have access controlled customer data store that has its own problem, or it is about cost. But doesn't necessarily mean if you can't replicate perfectly, it is useless, you can still catch problems with things that you can replicate and do go wrong. Ofc it is impossible to catch bugs 100% with staging, however, that argument goes either way.