Have you even played 1v1 in Closer Combat? It makes phase A pushes more difficult because the AT guns are already well-positioned - in spots they may not have been able to reach in time in the event of a rush during a Conquest game.
It guess it does favour some concentration of forces on start to break through these at guns on one part of the map quickly. The close combat mode allows you to do it. But to say the mode is static and defensive, sir no sir. After the start, there is no difference at all with conquest mode except for the +2% needed.