Assault is arguably the most difficult game mode there is for attackers. My suggestion is to remove the defender’s ability to keep taking the objectives back. Being able to fight over it is one thing, but once it is captured, it should stay captured.
Prior to capture, the defenders can drain the progression from the cap, but not once capture occurs.
You need rally points that is all.
Not a good idea, the assault maps are really easy to blitzkrieg, plus realism.
That makes it different from brainless invasion mode.
you need human players with braincell.
Assault modes have been one of these, that I personally disliked.
I have to admit, there is some charm to them.
It gives the defenders a chance to get capture points to complete daily tasks.