I think the big question is, whether two teams writing software on a fixed budget using Rust or C using modern tools and best practices would end up with a safer product. I think this is not clear at all.
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People have done just that with, for example, Firefox components and found that yes, Rust gives you a safer product.
Do you have a pointer? I know they rewrote Firefox components, but I am not aware of a real study with a 1:1 comparison.
I think it's very clear for anything other than a no-true-Scotsman definition of "modern tools and best practices" (which is sadly the only one that seems to exist).
(Ok, I should read the text before sending.)