Okay, I stole this from Aztec (hey, I linked the video), but still, he's right. As a controller user, it's a mandatory mod that takes up the slot of something else I could use. Not to mention with crossplay coming soon, this would only be a net benefit.
inb4 Just use m+kb
Edit: Not sure if everyone knows this, but m+kb already has Traction built in, it's called DPI. Controller users having it intrinsically would only level the playing field, again, considering crossplay, as well as freeing up a mod slot.
Its not "mandatory".
I never use it when I used to play PVP regularly. But then my play style as a Warlock wasn't based on high mobility.
So its a PREFERRED ability for a particular play-style. Which is what mods are about. The fact that it doesn't cost anything against your armor's energy level is a HUGE bone that Bungie has thrown to PVP players.