I designed this build right after the update because i said the same thing, 1 VoS+whirlwind combined with MoP is enough to wipe out every spike. I honestly don't see why people would want to weaken their build by bringing a secondary which doesn't help, and can be replaced easily for an enormous DPS boost. And, no D/A does NOT clear every mob solo, that's why whirlwind is there to clean up, it insures you only need 1 VoS. As long as the MT does his job(i always run with the best MT), and the MoP doesn't C+space like a pug, you'll come away with an ~17min manly-way chest. And, no you don't need Deaths charge, the only place you will ever need Deaths charge would be to jump from Forest Floor to the 2 oak hearts in forest, that is the only time you will ever not-be spiking adjacent to the MT(MT has them all 360'd in forge by the time the Rit and monk catch up). I would suggest this build for anyone planning to run manly guild teams(u now have 1 free spiker slot), or T3way(u filled that slot with another SF cause wiki told u to). But hey, dont listen to me, im a noob for not checking PvX as soon as they buff something, how dare i not use "Load Template".
I dont see how you can argue that D/W is faster than D/A, there are a few points to clear up i think.
1. DPS doesnt matter as a vos dervish, its about one single block of damage, not damage spread out over a long time, if DPS is involved then it's whats referred to as a "shit spike".
2. Using ebon escape as your jump is mechanically slower than than using death's charge. With DC you use one target and you use your skills in order. Unless you have an ideal key setup and awareness (which trust me, most people don't), targeting the mt, pressing ee and then switching to the mop's target to use eremite's will be slower, especially when you consider the fact that the MT might not be next to the mop target or you might ee in on the wrong side of the ball.
3. There are a number of spikes in fow where it is advantageous for the MT to not be next to the ball (spirit shepherds, shadow mesmers, etc), by taking ee you are either forcing your mt to dc into a ball which puts him into a bad position or could cause death, or you force yourself to run into the ball, adding in the risk of VoS getting stripped or you getting spiked.
There are a few other points i could mention but its not really worth doing. The D/A bar is simple and effective. If you need "more DPS" to do manly spike then you are doing it catastrophically wrong.