I think Rust’s async is very well designed for what it is: easy to build state machines that can be composed without heap allocations.

I think a lot of shallow criticism comes from people using Rust outside of its niche — when people aren’t writing the next nginx in it, but rather yet another blog.

This thread over at lobste.rs have a lot of good comments https://lobste.rs/s/6fjkeh/why_async_rust