SQLite is great, but the README is a bit disingenuous in not mentioning any of the downsides of using it (e.g. scalability concerns if you go beyond what a single box can handle.)
My guess is that they assume the reader is already familiar with sqlite. And "lite" is in the name Litestack. And it says in the second sentence of the description: "It exploits the power and embeddedness of SQLite".
Personally I think that's good enough.