Currently I kept the 50% rule to motivate the player find the ways to surround the enemy.
Yeah I have played a little more and I am starting to agree with the rule the way it is. It gives you a reason to surround/flank the enemy. It also makes games quicker.
When I was starting I just found it a bit strange that if you had your best cards at the back when defending they could be destroyed without getting a chance to fight.
There are pros and cons either way...