I've been pushing for GV's in scenarios since the first one I've flown. One of the reasons I'm told is that many of the recent events would be difficult to balance with our current GV set.
For example, a North Afrika scenario including GV's would be easier to do now, because we have the Panzer IV F. Give them the Panzer IV, bolstered by a handfull of Tiger's, and give the allies the M4 bolstered with a double handfull of M4(76)'s (to represent 6lber armed british tanks, and Tank Destroyers).
As I've said, before, and is undeniably true, the A6M's can fill in for the Ki-43's with less pronounced differences in combat, than we would have with using LW GV's for EW setups, and trying to balance those out by throwing in OTHER latewar GV's.
Not real familiar with the LaGG, and I'm leery of wikipidea, but isn't its preformance pretty close to the I-16's? If not, then I'll give you that one, for setup-specific vehicles.