Async/await have one property that is slightly more difficult to achieve with threads, but isn't really discussed much and hasn't been used much to my knowledge

Async/await have one property that is slightly more difficult to achieve with threads, but isn't really discussed much and hasn't been used much to my knowledge: because context is captured fairly explicitly as records, this makes it easy to persist that context to durable storage and/or migrate them to other machines without any additional runtime machinery. Achieving this with threads is possible but requires additional runtime support. Basically it requires scanning stack frames, which the garbage collector already does, so you're extending the GC to record stack in a separate place.