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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