Saxman, from the air the field of visibility is improved as when compared to on ground level. The icons thing just simulates that. However I will agree that the distances at which the "neon sign" appears must be reduced, to maybe 1000 yards?
But I think having icons on GVs for Gvs would ruin the ground war. However let the scouts see them, since they are the spotters and should be used as such.
edit: However I think GV icons should have no range associated with them.