I am currently working on a middle weight non-historical war game and one of my friend said that there is generally no market for that kind of games. War gamers don't want to play simpler games, and non-gamers does not want to play them at all.
One example of Middle weight war game I pulled out is Victory 2. According to him, this game did not sold well because it was a middle weight game.
Since I don't like heavy war game but still like war games, a few of my games might end up as middle weight war games. One of my friend's suggestion is to have some unique mechanics that makes the game stand out.
Also, apparently, war gamers does not like war games which does not have a historical themes. I generally like having a non-historical theme in a war game to increase it's replay value.