Guild Wars 2

Hey, sorry going to be a bit of a mess of questions in this thread but try and bear with me.
I’m currently level 58, and planning out gear and traits for WvWvW PVP at level 80. I really want to avoid going glass cannon, because being twoshotted is not something I find enjoyable, but what worries me a bit more is the people saying Elementalist basically needs to go bunker or go home.

Bunker just seems like the other end of the spectrum from glass cannon, but not really much more enjoyable because I can’t imagine I’d get decent DPS out of that.

So with that in mind, I wanted to go with a more all-round setup and I could use some opinions on it.
For gear, I was thinking I’d go with quite a lot of valkyrie and knight gear for passable vitality and toughness, but with power and crit thrown in. Pretty sad damage compared to the berserkers undoubtedly but should be more resilient (in theory.)

The big question here is: will this approach just make me terrible at everything rather than a decent all rounder? Does this class have to go either berserker or bunker to work well?

As for traits, earth is one I really want to max out because frankly it just seems awesome, but I’d like to get some points in fire and/or air but I don’t see many builds doing this. Are they just bad trees? Or is Arcana just mandatory?

Thanks in advance for any assistance.