I think if anything they should of gotten NS or debuffs instead of Earth build, and let Earth keep its pbt/gtaoe/aoe snare/roots. No reason Earth should have all of that, and Ice/Fire have nothing. It's almost they wanted to make Earth viable unlike Live and just went overboard.
Or at the very least increase its DD delve dmg. I believe the concept for fire build is to be pure DD caster? If that's the case the Delve on the DD should reflect that. You got Animist with the highest DD delve and one of the best farmers/CC'ers. Ments as well have a decent DD, along with pet, mezz, stun ect…
Perhaps increase Fire wizz DD delve to the same as Animist and leave out the ability to CC?
Give them the NS or Debuff's (might be OP having debuff to self DD, but then again idk the intent of the fire build.) They would have to cast debuff then DD making it 3+sec before a fire wizz can DD, assuming the target doesn't get out of range after being debuff'd.
Give some kind of CC other then its stupid single root.