I don't really understand your question here. NVM is non-volatile memory. Stick a filesystem on it and it's still non-volatile memory.
Do you mean they were writing configuration files directly to a known address in Flash instead of using a filesystem? It's much simpler and less resource-intensive and doesn't require writing and maintaining a driver. There are plenty of cases where direct-writes are better, and plenty of cases where a filesystem is better, and a nice big gray area in between.
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I don't really understand your question here. NVM is non-volatile memory. Stick a filesystem on it and it's still non-volatile memory.
Do you mean they were writing configuration files directly to a known address in Flash instead of using a filesystem? It's much simpler and less resource-intensive and doesn't require writing and maintaining a driver. There are plenty of cases where direct-writes are better, and plenty of cases where a filesystem is better, and a nice big gray area in between.