Sure, but taken to an extreme you see the absurd degree you have to contort yourself. And that’s to the current version of the proof checker - some unsafe’s are even only temporary until a better prover comes by.

You shouldn’t go out of your way to use unsafe, but between that and 2 weeks refactoring, I’ll take the unsafe and use tools like miri or ASAN to provide extra guards. Engineering is inherently about making practical choices.