The interesting thing about async / await is that for the coder, the code looks linear, but it doesn't execute that way. So a gap is opened up between "the perspective of the coder" and the perspective of the machine.

I think that bad_user means that if you await one client.GetStringAsync then await a second client.GetStringAsync, the second GetStringAsync only starts after the first one completes, so the first get "blocks" the second, "from the perspective of the caller". I.e no parallelism.

Of course, you don't have to do that. Code elsewhere in this thread.