[simias]

> I'm guessing you've never written heavily concurrent code.

Guess again.

> C/C++/Rust are totally fine when you have a single thread. It's concurrency and parallelism where object ownership and who gets to destroy what and when becomes a real problem unless you have GC.

Given that one of Rust's main shticks is concurrency and parallelism it's an odd thing to say. You can always use an Arc<> if you want reference counting between threads which is sort-of GC but opt-in and perfectly deterministic.