You pretty much summarized the idea behind the sector system HFB
Attackers need to coordinate so they take both (or all, some maps have more than two flags in sectors) the control points in a sector at the same time. Obviously some will be captured first, and then those attackers need to defend until the sector is clear.
I have never played Red Orchestra, but I heard they have something similar, or?
The most fun with sector is that the defenders can still re-take each individual control point as long as the sector is open. Earlier we had those flags with blue circles around them, they felt a bit boring since you only have a one-way fight over them.
Another map that uses a "semi-sector" push is Pointe-du-Hoc, when the Americans are holding the Observation Bunker and the Ammo Bunker at the same time, they both become locked and we progress. Then the Americans don't risk losing all that progress and start over on the beach.
A bonus effect obviously being that defenders are forced to rush out and try to re-take the flags, and can no longer just sit back and take pot shots at attackers. On top of this, attackers are constantly forced to attack, since they are bleeding non-stop until all the sectors/flags are taken
I hope we see more action and more team play with this, and that we have more clear win/loss criterias for each team.