Back on topic...
I think you missed the first post, Lazs.
GV fields are, as you know, much easier to capture than airfields. Making those V bases into A bases, would thereby negate the ease at which they can be captured.
The purpose of making a V base easy to capture is so that the vehicles spawning from that V base can be used to make a ground offensive against nearby A bases.
It's another facet in the overall game.
If you make the V bases as hard to capture as the A bases, you negate their existence to some extent.
Now, please don't take this as accusatory, but you are a verteran player, and probably know full well why there are V bases. Is this part of an overall campaign to try to eliminate everything in AH but fighters, or is this just part of the "Move the fields closer" campaign?