its clear that this game mode needs a rework so its not a rebranded attack/defence.
what i suggest is that there should be a 5-10 minute countdown after capturing or losing all control points before the game is ended, this countdown can stop if allied team manages to re-capture a lost sector from the enemy, or if they manage to hold all of their control points till the countdown ends.
game mechanic for all control points captured:
capturing all control points will not end the game immediatly, instead the 5-10 minute countdown will start and the team will have to hold the captured control points for those 5-10 minutes before the game ends.
if their control point gets captured during that countdown the timer will reset.
game mechanic for all control points lost:
losing all control points wont end the game immediatly, instead the 5-10 minute countdown will begin, and the team will have to capture a control point during those 5-10 minutes before the game ends
if they dont manage to capture a control point, they lose.
if they do, the countdown ends.
the last control point wont be temporarily locked like the others, instead it will be immediatly available to be captured by the enemy, this is in order to prevent losing time from the countdown due to the temporarily locked zone countdown.
i got this idea from the fact that every game is the same, as soon as you capture the last control point, everyone immediatly relaxes and starts shooting guns into the skies as a celebration.
but with this rework, they wont be as relaxed.
after capturing all of the control points, its normal that the enemy will immediatly try to re-capture their lost areas, which is something that many players have attempted but that defeat screen prevents them from doing it, this rework will give them a opportunity to do so