Dawger,
You are correct, the holes in planesets, and an accurate way of controlling the availability is something that the staff and development group pay a great deal of attention to. Having said that, most of the comments, have been on the positive side. I have to attribute that to the success of the staff in doing a great job. But the majority of the success, has come from the effort of the player base to share the sandbox with others.
When we talk about balance of Allied and Axis planes, that all depends on a number of circumstances. A faster plane equipped with 30mm cannon rounds it's pretty hard to convince some is the underdog.
What the no enemy icons in the arena has done however, has increased the need for visual cues in order to execute maneuvers that work best for your particular choice of ride. This is a new learning curve for some, and for others the adjustment may take longer or shorter.