Sorry I have a problem with "just" word in tech.
Rust makes it easy to use third-party dependencies, and if you don't want to use third-party dependencies, then you're no worse off than in C.
Not to mention C/C++ dependency situation is a low bar to clear.
The line has to be drawn somewhere. And that line is much more reasonable when you can trust large trillion dollar backed standard libraries from the likes Go or .NET, in contrast to a fragmented ecosystem from other languages.
What good is vendoring 4 million lines of code if I have to review them anyway at least once? I'd rather have a strong MSFT/GOOGL standard library which I can rely upon and not have to audit, thank you very much.