Themes that I want to see.
Telepathy (Communicate, Charm, Fear, Suggestion, Domination, Phantasm, Hallucination)
Force (Telekinesis, Fly, Magic Missile, Shield, Force, Radiant, Light, Force Constructs)
Prescience-Teleport (Esp/Divinate/Predict; Clairvoyance, Outofbody Projection, Teleport, Time Manipulation, bring body where mind is)
Shapeshift-Healing (Psychometabolism, Healing, Polymorph, Poison, Acid)
Elementalism (Fire/Lightning, Water/Cold, Air/Thunder/Plants, Earth/Crystal/Metal/Bludgeon/Pierce/Slash)
I think it is fair. The highest level powers can only come from ones chosen theme. Powers from other themes must be available later from powers that are lower than ones highest level. (To be clearer what I mean. Say a Wizard focuses on Elementalism. When reaching the 3rd spell level, the Wizard can only choose elemental 3rd spell level spells, such as Fireball. However, at the same time, now non-elemental 2nd spell level spells become available.)
Also, there can be archetypes within archetypes. For example, an elementalist might focus especially on Fire. A Prescient might focus on predicting the future and time travel. And so on.
‘Plants’ equates to Air, within Daoist alchemy. Air moves like a Tree. The five Daoist elements are fundamental motions, not substances: things that move up like Fire, move down like Water, contract into denseness like Metal, expand all encompassing like Tree, and supply space like Soil. Plants generate oxygen, so there is affinity between Air and Tree for other reasons too. In other cultures, the cosmic tree is the sky planted on the land, whose whose canopy of branches are the clouds and stars. Soil corresponds to Ether, but Soil is mostly understood as the empty space of Void, vacuum, and outer space.