Yes I wholeheartedly agree, rust is definitely overpromising in that department. The language has grown too large too quickly imho, and having the compiler as a formally verifying aide when the foundations/axioms aren't defined yet certainly leaves a bad aftertaste for me.

In a sense rust hasn't managed to reach it's de Bruijn criterion yet, see https://lawrencecpaulson.github.io/2022/01/05/LCF.html

However, the very same can be said for zig. Given that it is such a simple language, development has focused on a many interesting things including incredible performance, but one has to wonder if the priority shouldn't have been correctness and a fully working compiler that can handle e.g. packed unions.