Well, it's true that most of the noise comes from deallocation but I did mention types for good reasons: having your code littered with std::shared_ptr (or worse for Rust where encoding lifetime goes much further than Rc/Arc) is a direct consequence of wanting GC without a global one.

The source of my second revelation: GC should be opt-out (e.g. SBCL's arena system) instead of opt-in via refcounted types.