i agree with you that after playing the same scenario twice the element of suprise is kinda gone.You always knows what to expect and where the enemy will show up...you even know when and where the reinforcements shows.
It would be cool if this could be random in every battle...just the map was the same.
ofcourse i understand that you cant choose a tank battle and suddenly have just inf...but that you atleast had some scenarios that was random.
I have noticed that when i played a battle i first had lost, the second time i played it i always won..I even had to kinda restrict myself from not using arty on possitions i knew was there but could not yet see.
I would prefere that this was not possible because we never knew what would happend from battle to battle.