> Rust is a system language, so you should have the control you need

I don't think this argument is promising. Its not about the power of the language, but the power of the abstractions you provide over the various GPU APIs.

In fact, I could argue one of the main selling points of Rust (memory safety) has limited applicability in GPU land, because lifetimes are not a thing like they are in CPU land.

I'm sure there's other benefits here, not least the tooling, but certainly the language is not the main selling point...