I don't want to be dismissive but how much of this success belongs to the team of rock solid senior engineers with enough experience under their belt rather than rewrite in Rust?
Rust cannot make a bad programmer a good programmer, but the fact it points out several classes of mistakes (sometimes too aggressively, hopefully someday we get Polonia and other improvements to the borrow checker to remove some things that are hard only because of the current implementation of various checking systems) allows far more confidence. I don't care how good someone is, having an automated way to validate large scales of issues aren't there is a big deal, and unlike unit/integration tests you don't have to write these.
This mirrors my experience: getting buggy software out is easier and faster in JS (or whatever you're familiar without compile guarantees), getting something out to production is easier with rust.
Sometimes you have enough senior developers and discipline to reproduce and catch obscure bugs (which happen more or less based on your software complexity) and you can fix your mess but that's not always feasible.