I feel like for true build diversity to swap between elements,forms,etc. and to up their damage to be even comparable to necro/sorc/rogue, druid just needs to at least have the totem as a stat stick and extra legendary affix when using two handers and vice versa.
I know this is only to level 25 so it truly could just be because of us unable to get the specializations yet but this is just my take on things.