Yes, the original motivation for me was because I did not want to mess with Make or similar build systems every time I create a new project or make a big change. It is more similar to systems like Bazel or CMake, where you define tasks in a high-level way.

I internally already have rules for Android APKs (including NDK), embedding other build systems (CMake, etc), Git and JavaScript. Once they are ready, I would like to make them builtin as well. I'm also open to contributions. (: