Meanwhile, the other team have spawned a bunch of dudes who have sprinted to the cap-zone, taken it and are scurrying about behind you taking the next cap. 30 seconds later, the map ends.
There just isn't time in the game for the employment of "real" tactics. All you can do, is employ in-game teamwork, tailored for the game environment - not stolen from a Wikipedia article that applies in a completely different context, that being the real world.
Maybe people just don't give a crap about "tactics"?
War: not so much.
Game: die, respawn.