Regarding lining units up on each side of the table and charging to
fight in the middle -- well, that happened a lot in ancient times,
and even into the 18th Century. Modern warfare is characterized by
great fluidity, and we should expect the near future (where GZG games
are set) to show more, not less, of the same.
SG II, e.g., allows grav vehicles in high mode to go to any location
on the table. That creates a kind of unpredictability and surprise
that is both authentic and fun to play.
(OK, they take the risk of getting shot down, but, you know, war is
dangerous and stuff (to paraphrase an old friend who's a career
officer in the US Army). Maybe you have to send two or three grav
vehicles and expect to lose one. Maybe you can jam the other side's
missiles.)