Having said all of that, I do agree that there are many programs where Rust's defaults don't add a lot of value, and it would be nice to have access to shared garbage-collected data without the syntax overhead of Arc<Mutex<T>> or crossbeam_epoch.

I really like the discussion on resource types vs data types in this essay on higher-level rust-inspired languages: https://without.boats/blog/revisiting-a-smaller-rust/