I rarely see any Elemental Pathfinder build?

How come I don't see Pathfinder that is not Poison-based build? Her elemental passives are really that bad? Veteran Bowyer sucks? Master Alchemist seems like a waste of change IMO.

I am trying out Explosive Concoction and the ceiling for this build is very low. Unlike Poison Concoction, I run out of flaks during boss fight often. I already took masteries and even Flask Alchemist Genius.

I feel like Veteran Bowyer doesn't add much to Explosive Concoction because the skill itself doesn't have Physical damage to get the 15% bonus.