I love Rust. But in my experience, and maybe this has changed, it's hard to write large projects in Rust. I Rust was developed in an environment where computing power was cheap and abundant, so they could afford to compile everything for most projects. As with so many things at some point, however, "compile everything" starts to become a significant technical debt. You'll want to just utilize a black box library and some headers. This is especially true for companies that develop proprietary software. Even within the same company they don't want everyone to have access to all the code.
But, for example, KDE is 25 million lines of C++ code. The largest Rust project is Rust, at 110k lines of code, or 227 times smaller. There aren't any great Rust UI frameworks like Qt, which is 3.5M LOC.