Once in a while the Rocket Barrage will simply fail to deploy. It will be called in and be confirmed, you'll hear the rockets being fired in the distance but they never arrive. I have no idea what causes it but it is super annoying to have your most powerful ordinance bug out, often.
Restricted areas really need a revision. Like you say, on some maps, areas close to the objective is out-of-bounds for some reason while others aren't.
Personally I'd like to see them, if not entirely removed, then at least massively down-scaled. Maps feel way smaller than they really are because so many routes are blocked off to restricted areas.
I get your point, I really do. I don't agree on it though. Doors in the game, much like real life, are bottlenecks. They are extremely dangerous to traverse through, and I think the game signals that well. Insurgency thrives on these realism elements to make the virtual battlespace feel a tiny bit more real. A map without doors, doesn't convey that.
Also, since when has map balance been a priority? Sinjar anyone?
Playing an observer isn't the most gratifying experience as it currently is. As a result, alot of people aren't interested in filling that role, often leaving the commander useless as well.
A way to combat this, could be to make the commander viable, when no one has picked observer. Of course this would have a downside to not be overpowered. For example, since the commander has to call everything in himself, the time it takes between ordinance calls could be increased by 50%.
Then a team with no observers could still get the benefits of fire support, albeit at a slower rate.