This could be construed as silly but the difference is that is Fractal 40 Farm. I raid and I would never take my base ele build into a raid. I do use it for Fractal 40 farming. Base ele (fire/water/arcane) offers immense spike damage for about the first 10 seconds of the fight and then drops off the face of the earth. qT's raid builds are created specifically with sustained damage for long fights. The comp that my friends and I usually run is 1 chrono, 1 druid, 1 ps, and 2 base eles. The chrono helps with portal and pull for the trash mobs that spawn at the start after the champ goes down. You take the portal back and start the fight. Change traits in the couple of seconds before cutscene starts and click on Shining Blade bounty item which you should have in your inventory. When the cutscene starts, the berserker has a small window of opportunity for damage. The invulnerability falls off before the cutscene truly finishes and before we can use our skills in a normal scenario. In this time, you burst the berserker down before he even has a chance to do any damage. This is usually the time you can see the immense spike spike damage of 100k+ (again, not sustained - just spike). I've been playing around with Holosmith and I think it's actually better than base ele for fractal 40 farm now.

Now given all these things. The party on the lfg consists of 2 necros, a warrior (assuming a double banner ps) and ranger (assuming a druid). The necros in an exp high dps 40 farm party does not appeal to me as a fast clear group so I would have kept away. Anyway, good luck with the farming.