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There are some situations where I can see Rust's type-ststem potentially being counterproductive. For instance, it may be valid to invert lock order in a chain of operations under some circumstances, and rust might prevent you from expressing that. I grew up with C (from the pre-ANSI days) and while lifetimes and ownership are things that good C devs care about, they are tacit - and the ability to play fast and loose when necessary is great.
The linux kernel is built on a foundation of these implicit semantics. Some of it is written down, some of it isn't. I can see why asking "but what does this mean?" can lead to frustrating conversations and overly-qualified answers, but not everyone in that video was hostile to the prospect.
Is that not what
unsafeis for?It's what C is for, too.
The point is that there may be cases already where the type system that rust provides its guarantees off the back of is insufficiently expressive. (I say "may be" because there are ingenious qays to use what it does provide, although nonobvious and not necessarily without cost.) If you're using
unsafethen it's just an uglier C. I don't think anyone considers the current state of Rust's type system to be the be-all and end-all of expressivity.