Given that Linux kernel is using async Rust which is implemented on top of kernel workqueue, and tokio won't be usable in kernel, it is a good thing tokio is not blessed. That's what enables both userland and kernel to use async Rust.
There can be both a "blessed" executor, while staying optional for such cases.
For example, Rust std lib has blessed Mutex. Even though these can't be used in the kernel, it is still good to have them in the std lib for >90% of normal crates.
