Depends if you have to split forces due to objectives. I might lose all my synapse on my left flank and the left flank would run to my synapse creatures on the other side of yhe board. It didn't happen often, but it can cause you to lose the game, because the gaunts are stupid.
Well you had some objective based missions in 4th. Also if the enemy is not all together that. You have to split your force every now and than. Not to mention that your non synapse hand fleet which meant they can out distance most synapse since mose synapse creatures didn't have fleet. Also don't forget endless swarms which I stopped using.
It didn't happen often, was annoying when it did. I might run warriors again, but I doubt it.