You may be correct in theory though in practice the reason to use Async over threads is often because the crate you want to use is async. Reqwest is a good exam

You may be correct in theory though in practice the reason to use Async over threads is often because the crate you want to use is async. Reqwest is a good example, it cannot be used without Tokio. Ureq exists and works fine. I've done a fairly high level application project where I tried to avoid all async and at some point it started to feel like swimming upstream.