It is more along the lines of camping the borders against an overwhelming enemy, to snipe a few guys, retreat, reload ammunition/swap armor, run back onto the map, and do the process over and over again until the enemy numbers are much more manageable that you don’t need to bother.
This was always there, it’s just a question of whether the enemies were difficult enough to warrant such tactics.
But this change wouldn’t affect this strategy of hit and leave map if you were leaving the map anyway. Once you leave the map, the fact that you left the map with breaking morale doesn’t affect your morale when you go into combat again later.
It will change the strategy a bit; the idea was that you would sit on the edge of the map, and instantly flee the moment an enemy gets his turn and can attack, because fleeing can happen at any point. Now, you have set up one tile away from the edge, so if the enemy catches up to you, you must have Footwork on everybody to trivially escape (from getting caught in melee).
The other point being that it is now extremely risky to sit on the last tile, due to potentially getting ‘fleeing’ status if two enemies walk up to a low resolve Brother. And thus, the brother wasting his turn walk around getting smacked by the enemies that caused the status, if you weren’t already ready to pull out.