Give every hero a short self-cleanse

As I was getting stunlocked to death earlier I started thinking about how in pvp, everyone has an insignia ability. Why not just give this to everyone? Doesn't have to be a long one, just one that breaks the stun, so say .1 seconds long or something similar. Long enough to break small stuns like Taunt or cheapshot so you actually have a chance of surviviing, but still not able to get you out of a moshpit.