When you lose an objective in Push, you are no longer able to use any weapons until you retreat to the next one. An understandable gameplay mechanic, but kind of annoying as your hands are tied even if you're running away to continue playing the objective. I think you should be able to stay in the restricted zone as long as you live, and once you leave it you can't re enter without the warning. This or implement a time limit so you aren't defenseless when retreating.
There are some restricted zones that seem pretty senseless and arbitrary. For instance, when defending in Oilfield on Push, to the far left of A there's a corner. You can't get in the corner, and the corner provides no unfair advantage, it's just a place to take cover.