It focuses the battle, prevents draws and delaying. Yay. It does not prevent the underdog team to get a win on the brink, but it does prevent a silly horsearcher riding around ten enemies missing 9 out of 10 arrows and claiming that he is just playing his class.
I like to see anyone get good accuracy while moving with HA. And don't point out trot archers, or archer on horse. If HA's could trot shoot that meeans their team has achieved cavalry supremacy, and thus was likely to win the round anyway. Thanks to "balance", missing 9/10 shots is part of HA life, and thus is playing their class. If HA's could make the shots, they would headshot everyone in 30 seconds and wrap it up quick, but unfortunately you can watch the misses instead.