Slava @ RethinkDB here.<p>The main goal behind Fusion is to let people get started quickly, but eventually any meaningful app will outgrow the Fusion API. When that happens, instead of starting Fusion as a stand-alone server on top of RethinkDB, you&#x27;ll be able to load it into Node as a library and integrate it with koa&#x2F;hapi&#x2F;etc. That will provide the Fusion API to your node app, and an upgrade path for modern complex applications. That&#x27;s an essential part of Fusion and will ship along with v1.