Changes:
- I've replaced Power Surge with Sorcerous Surge which is a reflavor and rebalance of Metamagic. See #161: Create stronger class identity for the Sorcerer
- #169: Use PF2's dying system instead of exhaustion to avoid whack-a-mole
- Default theme for each class or subclass for Occultist, Psionicist, and Sorcerer
- Removed Ritual Caster from all "full caster" archetypes. Slightly modified the Occultist (via Grimoire) text and added ritual casting for the Mage (via Spellbook).
- Ectoplasm theme renamed to Astral
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My system not having these differences is a feature, not a bug. See RAW Caster Comparison to see the RAW balance. One of the main goals of my system is to balance out these issues while still maintaining identity and also allowing far more character diversity and options.
The descriptions I use are largely from the PHB. What you've quoted also appears as the first example of a Druid on page 64 of the PHB.
Yes, an Elven Mage could take the Nature or Storm theme! Elves studying nature and their natural environment makes complete flavor sense. It's a feature, not a bug!