> Leaving that aside, I was still hitting Rust "oh look the developer of this crate on which the entire universe depends still assumes that everything is x86

Anecdotally, I had the same issue recently with a C++ tool I wanted to tun on arm linux (forgot what it was; but it was a WASM tool. I ended up using a Rust alternative that was less mature, but did all I needed anyway)

Lastly, the issue you're describing is more of a DevOps one. C++ has a longer history, and one would hope it has accumulated more DevOps wisdom over that period of time.