Personally I think there are lack of life themed abilities, or nature if you want to call it that. As all classes have elemental based abilities and spells in their arsenal and expecially wizard, monks and barbs. Holy spells are iconic of Crusader and Monks and Shadow to Demon hunter as is poison and undeath to WD.
What I'm saying is I don't feel the life themed abilities and concepts are that constructed in the game yet and such as something that grows from the earth, blooms, reincarnates, tree magic with spiked thorns surrounding and grasping victims and sharp leaves soaring in the wind that cut everything to pieces, a growing flowers that blooms after a small amount of time and explodes in fire etc. Summoning rain that heals allies and hurricanes with lightning strikes that knockbacks and slows enemies. Gigantic Behemoths, Eagles, Bears, Ogres, Cyclopses as companions, summoning powerful spirits that grant unique effects to allies for a duration of time such as movement speed with knockbacks, or healing and reviving dead allies and the player if they die or absorbing magic/physical damage etc.
Shapeshifting into a treant that roots you down temporary, increasing Armor and Damage, or a Gigantic beast the does melee damage, a Stormbird creature immune to cc that flies over npcs raining Lightning.