so in other words they couldn't produce on combining the 2. They wanted to be the first but realized it was too hard or did not want to be embarrassed.
The problem is, with PC they can just make the update and send it out. With consoles there is a couple weeks long verification process for any update.
They have done cross-plat before with portal 2.
But CS is a different monster, since its multiplayer(and its CS with a long time community), it will require constant balancing and exploit updates. And they didn't want to make the PC crowd wait while the console patch went through QA.