This is a great issue for debate. I've been thinking about this quite a bit.
One of the things I'd like to see more of is balanced scenarios that require an attacker to exit points off of the opposite board edge, rather than scenarios that focus on fighting for Victory Flags.
Most of the great balanced scenarios seem to be Meeting Engagements in which the two sides fight for a few Victory Flags. It must be very difficult to design a scenario using the format that I suggest above.
I really admire you folks who have developed a talent in designing medium to large scenarios that are balanced, because I could never do this with great skill unless I devoted most of my leisure life doing this.