Key value stores are useful, and they are especially useful in this form factor. On the other hand, you now have a very large black box that you have to somehow navigate in order to create a workable system. Given that this is likely an arm core running linux on the inside, I would have considered a slightly more open approach to be 'Here's a working KV store using backing db X and here's how to reflash it if it doesn't quite work for you'.