Now to start off, no this ain't a flame really, more like an biased opinion.
Some folks don't care for the ground stuff at all, And some folks would like, just like in aircraft, to see a wider variety of them.
I don't think there is a reason to add more, Why? because until the terrain reaches the point where there is cover for them, they're toys, not sim products, I don't care if it's green or brown, made in Germany,Russia,or America, Anyone who can get a Chog or Spit off the runway can waste them, and there are a great deal of folks in here who can do far more than merely getting off the runway, So IMHO (and I do mean humble) additional vehicles are wasting time and resources as the environment is not suited to them.
Please don't use historical context to refute this, we're not discussing history, but the MA.
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pzvg- "5 years and I still can't shoot"