[_bxg1]

It wouldn't be written in JavaScript because JavaScript wouldn't serve a systems use-case very effectively. That's exactly my point.

Assuming Microsoft isn't talking about solely using Rust in Windows The Operating System and Linux The Operating System, they agree with my definition.

[doliveira]

Kubernetes could have been written in Typescript, for instance. Pulumi is for writing infrastructure as code in Typescript. Is Javascript a systems language, them?

Keyword being "closer" to the operating system, of course it doesn't mean just syscalls and Assembly. If you define "system" in "systems programming" in this broad sense of "something that other things call" you dilute the meaning of the term. Any program becomes "systems programming" then.

I'm sure that most people didn't use the term in this sense before Go's creators did and till this day I see only the Go community re-purposing the expression. I'd be happy to be proven wrong, though.