You are wrong about that. For starters, AW simply had a few WW1 a/c modelled as an add on, not as a stand alone sim, secondly, Warbirds dropped any serious development (read $ money) from its setup, and so DoA never got the backing it deserved.
Thats like saying because AW had a F-86 and MiG-15 that they tried a Korean war sim.
Nobody has yet come out with a stand alone WW1 sim, designed that way from the ground up, and backed by some hard cash. They have all been player developed, add-ons, or boxed sims like Red Baron, converted to be online games. DoA was the closest, and they didnt follow through with it, after IEN decided to stop developing and just sit there and rake in the money (worked for awhile, but that strategy is a doomed one long term).
I beleive a WW1 sim will come out at some point, and it will be popular. My guess is it will come from Europe, since N. American developers cant seem to get intererested in in anything nowdays except PS2 and XBOX games for 9 year olds.
"I hate that game my planey keeps spinning mommy". "Try Supertrack Need For Speed 2 sweety, your sister likes it"... God help us.
As for Jet Sims, they have their place, but are hamstrung by this notion that if they arent about the F-22 Raptor or JSF that they wont get attention.
Its all very sad, so much we could have, but that just is not pursued. I hear Star Wars "Empire At War" has a Death Star though? kewl.