Stasis slow already stuns overload and shatter is a great way to deal with unstoppable champs, neither of the verbs are even difficult to activate. Changing shatter to stop overloads is not only detrimental unless you're ability inflicts raw freeze debuff but is pointless since most stasis sources slow than freeze, since the slow mostly occurs first the overload is already stunned, taking away the unstoppable on shatter hurts the subclass more than it helps it.