Well to begin with there's not always enough warning you're in a protected area, there's text on the screen but it's just as noticeable as artillery incoming, and is easily ignored when you're slowly clearing rooms and on edge.
But my main gripe is when you're attacking an objective, only for other objective to fall and you're instantly in a protected area with no escape.
Example, Spartanovka.
You lose the church and everybody falls back, but you manage to push forward again and begin clearing out the church and begin to regain it, only the germans have been pushing forwards too, and have taken the first block of houses. Suddenly the church is uncapable, and also becomes a protected area. You have about 5 seconds to GTFO, which is never enough time, and then all your limbs get blown off. You've basically just been killed for doing your job.
But my main gripe is when you're attacking an objective, only for other objective to fall and you're instantly in a protected area with no escape.
Example, Spartanovka.
You lose the church and everybody falls back, but you manage to push forward again and begin clearing out the church and begin to regain it, only the germans have been pushing forwards too, and have taken the first block of houses. Suddenly the church is uncapable, and also becomes a protected area. You have about 5 seconds to GTFO, which is never enough time, and then all your limbs get blown off. You've basically just been killed for doing your job.