The right click? Remember that is a very delayed shot and is typically not easy to hit long-range targets with.
While she can pierce through enemies with the left-click, the ability to freeze everyone at once is nearly impossible in a realistic team fight, One or two yes, but not all six at once.
Not truly entirely but it is intended to zone out enemies.
Because that is needed for her slow-traveling left-click spray to effectively land enough. This might be viable to nerf slightly like 20%, but I have seen a proposal from GreyFalcon that is much better.