It's unlikely they would ever allow for it on bosses. They would argue that counters (except on few bosses) is a way to control them. I think there's confusion on the match part here. Even on test server you can control Matches for some time even though it's not exactly like Live server. They still breakout earlier than they do on Live. The duration depends on the power you use aside from the NPCs own breakout. Matches and higher ranked NPCs aren't always designed to be controllable for long periods. Some are but always have breakouts on Live. Matches and higher ranked NPCs are designed for tanks to deal with as well. Herds of NPCs usually have a mix of NPC types, both matches and/or lesser ranked NPCs like minions, because there are ones controller effects will control repeatedly and those that break out so the tank has something to deal with. That includes countering, taking damage from them, moving them, just overall interaction. You can't have all match and higher rank types be controllable in every raid group indefinitely otherwise there is no need for even 1 tank in fights on the way to bosses. In boss fights that can vary and since we can't control bosses, that's where controlling for longer periods on match, minion and less ranked types would be best since the tank is already occupied. NPCs need to be given higher threat levels that warrant the need to control them. Even if they break out quickly that isn't a bad thing as long as their immunity does last long. If they breakout and their immunity window is small, you can just control them again and that's interactive because you have to hit a power again. Thats how you would go about it since controllers can't stun for longer than 15 seconds on test anymore. The most a NPC would be controllable for if it didn't break out would be 6 to 12 seconds flat depending on the power. They nerfed the role completely but so far changes were made to make it slightly better than how Mental was when it was released on test server last month. I rather take "garbage" over "complete garbage" is the only way I can put it that seems opimistic.