Originally Posted by FOG3

Are you talking about for defense systems, or mainline weapons? Seems as how KE weapons have an extra momentum component to help with penetration, that a purely energy approach does not it isn't necessarily the way to go. With the move towards composite armor, which is at least believed to have ceramics in it, it's not like planned vehicles aren't setup to deal with energy weapons, either. Of course particle beam weapons are a little more tricky, but they have their inherent issues, especially in atmosphere.