Cometeor's biggest problem is that when its spammed there is little room for counter play, likewise melee LB has a similar issue. That the damage is so high, that most classes will be one shot leaving no room for counter play. A lack of counter play is bad for a competitive environment. What SE needs do change how both Cometeor and Raw Destruction damage works. Instead of full damage upfront, it can deal 50% direct damage and the other 50% damage takes the form of a DoT. That way the counter play is the DoT can be removed. If not you slowly die.

Both LBs will still be powerful but now players will have the ability to counter them.