[steveklabnik]

Async await is already syntactic sugar for futures, and does not require any specific executor.

There’s no plans to add an executor to std for all the reasons I’ve said.

[pjmlp]

Which makes Rust stand out versus what Java and .NET already do, and what C++ will do (even if they are only fully done by C++23).

Standard library executors are guaranteed to be available across all platforms supported by the compiler, with a validated level of quality for production loads.

Random implementation from Internet not so much.