The separation for me is more about layers. If you're writing anything touching an OS, your choices are basically C, C++, Rust. If you're writing a web backend application, Rust isn't a good choice, and even Golang is questionable.
But that also means that it is not necessary for pretty much every company out there except the biggest ones.
Rust is cool for interops though: you talk about the OS, but it's not just that, it's also integrating with other languages in a way managed languages can't do: you can use Rust in a Python app like you'd use C, and you can speed up critical section of your node App with it as well[1], this is where Rust shine. Not in competing with Go in online popularity contexts.
For fe, I use ts with htmx for any server side rendering. I got very deep into nextjs enough to consider myself competent but code bloat and dependency breakages just got me off it
For backend/control planes like things nothing has come close to Go for me. It isn't perfect in any one axis, but has a bit of everything I need mixed (fast build speeds, CSP style concurrcy for managing orchestration related workflows, reasonably good typing, and runtime speed), well rounded stdlib, fewer dependency breakages and soon.
Node is awful with lots of connections. Go gives me way fewer bugs, easier to properly trace, static typing is a blessing, etc.
With a db that can handle thousands upon thousands of connections, Go trounced Node in my experience