True, but that said, it it was never a feature that was promised in the first place, it was an addition. It was never part of the original Combined arms scope. It was implemented as a bonus for single player, a programmer implementing something fun, because he could. It will take quite a bit of co-ordination between the teams to get it to work in Multiplayer. It isn't a trivial task, and not one that was ever promised.
Nate