My biggest issue with Light Vehicles for the most part is that they function as mid game shock units and offer no utility late game. All Light Vehicles should be able to function as recon units without needing to gain vet for it.
Actually, most of them do.
The T-70 is a powerful scout from Vet 0, the SU-76 is a light artillery tractor and the Puma and AEC have stuns.
The issue is more that utility is vet gated, so you only use the LVs you vetted in the midgame.
LVs would be more viable later in the game if their vet was restructured so they have all their utility up front and gain their
stats with veterancy.