100% this. As I say elsewhere in these threads: Rust is the language that Tokio ate. It isn't even just async viral-chain-effect, it's that on the whole crates for one async runtime are not even compatible with those of another, and so it's all really just about tokio.

Which sucks, if you're doing, y'know, systems programming or embedded (or games). Because tokio has no business in those domains.