This is really it. Tons of the utility of WLs is tied to a pet that will get deleted in a second and that half of people don't even use. Maras and mSHs are the utility machines.
Want to have the burst dmg from WLs, etc. lowered? Well then take away some of the utility and survivability of mSHs and Marauders, then I'm gonna be fine with it. Right now, the balance literally hinges on WLs being able to burst so well, while destro side has all the utility and CC suppression in the world.