That's often done, but Rust is shipped on all major Linux distros using the system LLVM, which is often at least 6 months old, or years old, so it needs the workarounds anyways to be able to work with those. The LLVM fixes take a while to percolate back, and Rust supports up to LLVM versions that are ~2 years old (LTS linux distros). The workarounds can only be removed once versions without the fix are no longer supported.