As a certified member of the Rewrite It In Rust (RIIR) Reaction Force, let me answer this by saying that it’s very, very hard to get the software right, even the second time, and RIIR trades one set of unknowns for another. There are also a huge number of people who are convinced that Rust is a fad, or that C is good enough, or whatever. The same people who swore they could outbrake ABS decades ago. They do not want to learn a new, hard thing, and Rust can be hard at first.