Whether or not Battlefront would ever release any of their Combat Mission games to Steam has been a matter of hot debate amongst their fans for as long as I've been Editor here. They've never seemed that bothered, but plenty of their fans have grown weary of their approach to things like DRM and Patching and you'll always see threads pop up every now-and-then asking "why not?".
Steam isn't the be-all and end-all of digital publishing, but it certainly has its uses; but from my POV I've never thought this was actually about Steam. As an observer, Battlefront has alwayed seemed like a bit of a home-brew operation. A bunch of passionate grogs making wargames they want to and probably can't be bothered to change - especially because you can't get away with Battlefront's more cavalier attitude towards development as much on proper digital channels. They would make & sell their games the way they wanted until the end of time...
... so imagine my surprise then when I get an email about Combat Mission: Shock Force 2 coming to Steam.
RELATED LINKS:
Review: COMMAND: Chains of War
Review: Command LIVE Episodes 3 4
Review: Command Live Episodes 1 2