There should be a path for local building as well. Node.js is being used on a lot of embedded systems. I’d imagine there are also lots of other reasons for local builds.
there's fallback to build from source but it would require the builder to have all the toolchain installed (whatever the library is using: could be gcc, python, rustc....)
there's fallback to build from source but it would require the builder to have all the toolchain installed (whatever the library is using: could be gcc, python, rustc....)