[innes]

That operation also needs to be async itself, and ultimately it needs to be implemented as running on a separate execution queue.

Yes, but this is the relatively easy bit. It's writing comprehensible code around and about that underlying async operation that is the hard bit.

Ultimately, `async` and `await` still are nothing but sugar over the Tasks API.

The tone here implies that sugar is not an important thing in programming languages. These keywords do a great deal for you, under the bonnet. Everything is 'sugar over the assembly language API'.