This library provides a subset of Relay's behaviour with a cleaner API. Relay is a great framework with exciting ideas behind it. The downside is that in order to get all the cool features, you need to deal with a complex API. Relay provides you a lot of tricky optimizations which probably are more suitable for huge projects. In small, medium and even large ones you would prefer to have better developer experience while working with a simple, minimalistic set of APIs.