thanks for hijacking the thread, australian magic. super cool of you. no one cares that you think FRPs are cancer. you've posted that in pretty much every other thread for the last month.
Australian magic is right about FRP.
On topic : I think you make a valid point in regard to vet3 more or less being equivalent to green cover but your suggestion to limit it to only applying whilest in cover will surely produce lopsided engagements.
Usf can only build cover in two doctrines or by re's building tank traps, so that is an instant disadvantage. Furthermore as the game goes on, the amount of green cover reduces as it is destroyed, which in turn will swing the balance of the engagement in favour of the defender.
Whoever gets to a position first, if time allows can build green cover, instantly giving them not only the advantage of cover but vet RA multipliers as well. The attacking side would be at a huge disadvantage and would probably resort to blobbing to regain the advantage.
Furthermore, usf for most of the game is the aggressor. They have to attack and they have to maintain constant pressure or it is gg. They're generally not stopping to build cover when they assult a position.
Consider the wild swings in a units survivability as it moves in and out of cover. For example, volks vs rifle, both units in green cover. Volk throws a flame nade, usf moves out of cover and looses all its vet RA bonus. If it cannot find cover immediately, then retreat is the only option as it is suddenly vastly weaker.
The idea is good in theory as it promotes tactics and positional play, but the reality is, once the game reaches that frenetic stage its too much to expect that units only get vet benefits by being positioned in cover.