Compiler afaik will never be able to correctly 100% identify you are or aren't breaking some properties due to Rice's Theorem.
That said, you're committing a Nirvana fallacy. Perfect doesn't prevent improvement.
E.g. seatbelts don't prevent being stabbed by a large metal pole, ergo it's useless.
Every week I see newbies coming and asking why won't compiler allow this - and then point a hugely unsafe action.
Hell, I ran into a similar issue. I wanted to expose something mutable as immutable. My argumentation was but it was immutable at time of calling. However as someone in Rust discord pointed, using that you could cause UB trivially.
