If you forget to do it in C, everything still looks superficially right.

If you forget to do it in rust (or zig, or typescript, or any of the hundreds of languages with option types), your code doesn't compile.

Nothing precludes "simply do not fall off" when working off heights, either, but there's a reason safety harnesses are mandatory when working at heights in most of the developed world.

Nothing precludes having legible programs in Brainfuck[1]. It's on programmers to actually do it.

[1] Other than the language itself.

Same goes for C, it's reliance on weakish type system is what causes its numerous fuckups.