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> There's not even anything technically interesting about the language
It's a modern statically compiled language with complex generics, that supports providing a generic interfaces in libraries with retaining ABI compatibility. Which no other modern "system" language supports. That's fairly technically interesting to me.
> We have so much more than that and you just went with reference counting
Like what?
The options for memory safe shared ownership are refcounting or GC.
Assuming you're talking about rust, that's just C++: object lifetime is lexical, and if you need it to last longer you have to use Arc/Rc/shared_ptr. The purpose of the lifetime and borrow checkers is to ensure exclusive access, and reduce the copy/destruction churn that you get from the C++ model (a hypothetical C++ that only allows the use of unique_ptr instead of raw pointers - obviously C++'s type system and approach to memory safety is not a Good Thing).
But it's important to realize rust did not create a new solution to object lifetime management for shared objects.
It's also important to realize that rust was designed in an environment where there was no existing code to interoperate with, whereas Swift was designed to work with the existing Darwin APIs and objective-c which are all refcounted. So even if no refcounting was the goal you'd end up with a new language, designed for a specific environment, and the default behaviour would not be correct.
Now that the language is more established, and it's less critical for every part of the language to have objc interop they are working on pure ownership semantics, for the same reason as rust: it saves copies without requiring a refcount[1]
[1] https://github.com/apple/swift/blob/main/docs/OwnershipManif...