It’s mostly a WvW thing. I don’t like having to keep two sets of gear around, so I built for the more restrictive one and just have to play harder in dungeons to keep up on damage. :P
One of the awesome things the expansion allows you to do is get Fresh Air with a survivable build. Scepter/dagger has decent single-target damage: I start in air, do the quick skills rotation there, then switch air-earth-air-water, using crits from the three-hit autoattacks in earth and water to get back to air for the on-switch lightning bolt and the lightning bolt skill. I usually save fire for might stacking.
Anyway, I’m always happy to chip in with build advice if you want it.