The problem with allowing targets to be CC'ed is that tank companions do not honor crowd control. If you cc a target, then send your Comp in to a different target, when they finish their first mob and move to the next, the also grapple in your CC'ed mob, which will ultimately kill your tank more often than not. That is an issue. Also, they stated that tank threat was boosted, but of all of the heroics I have seen, as a Sniper, I rip aggro all the time. This might be due to the fact that the comps are not putting out enough damage, therefore, allowing aggro to be ripped. This occurs consistently.