Originally Posted by
Maxweii
The intended design is 100% not to be full ranged, you lose out on a lot more than just FW/FS damage, melee white hits, Apocalypse use (and thus army ghouls and their debuffs/explosions). It's just an added bonus really, nothing more.
One of the biggest things it does for you though is you can drop DnD on yourself while staying on the boss, then tab to a group of adds and use CS to cleave all of them. If they all had say an Immolation aura or some other reason you shouldn't be near them, this adds a ton of extra damage on them from a melee dps source that otherwise wouldn't be there, burning them down faster and getting people all back on the boss.