Monroville said:

Let's put this into context: what would soldiers in WW2 do after a german tank is successfully taken out from say a planted mine from a soldier crawling underneath? Get out of their foxholes and expose themselves to the other tanks, or cheer, keep their cover, and then start arming themselves with grenades and planning on repeating the same successful tactic?

I see your point but it seems logic is not supposed to work here... :)

E.g. it seems pretty obvious to me that the best approach against the walkers in Hoth would be not attack them directly but blast the ground on their path to break their balance; and while the rebel shield could repel any bombardment, they still had to open it to allow the transports and scouts to free; if the imperials kept shooting at the shield just enough to prevent it from being open, the rebels would be trapped by their own protection, similar to what happen in Coruscant in one of the Thrawn books... :)