WayOfTheFourElements
Hero
Is the DM going to let a sorcerer edit every single spell in the game every single time they cast a spell?
That's what psions do. That's why they usually are shoved in their own book.
The DM doesn't need to edit the spell, the player simply makes a request (Can I apply my heighten power ability to my levitate spell?). They DM makes a ruling in the moment based on 1) the world, 2) the character, and 3) the situation. No need to rewrite every spell.