Because there isn't a good way of distributing pre-compiled cross-platform C libraries. So if you want to use a parsing library written in Rust, for example, yo

Because there isn't a good way of distributing pre-compiled cross-platform C libraries. So if you want to use a parsing library written in Rust, for example, you'd need to add Rust to your toolchain, which is a pain. One solution to this problem would be to write an LLVM backend that outputs C. Maybe such a thing already exists.