two said:
This isn't a big deal at all with magic-using PC's. They can't increase their power output quickly and freely.
Psionic-types can, and do.
It's a rather "hidden" advantage that I would be wary of. It might force you, as a GM, to change the way you set up encounters and play the game.
If you do a lot of "one big battle a day" encounters -- the psionicists are going to look, feel, and act very powerful.
Not convincing.
My 6th level Psion has 46 PP (she has 2 extra ones due to race). That means that she can throw 7-9 powers in the 5-6 PP range.
Considering that she does not go anywhere without Inertial Armor up which is typically 5 points for the AC 16 version and it lasts for 6 hours, usually she uses up 10 to 20 points a day on that alone depending on the day (AC is crucial for survival in DND).
Now, she is down to a maximum of 41 PP, that is if she gets caught in the morning with an encounter. If caught in the late afternoon, she is often down to 36 points or 6-7 max powers.
Our 6th level Warmage has 4 max level spells, 6 max level -1, 7 max level - 2, and 6 max level - 3 spells.
This sounds pretty darn close. If she goes full bore, she is done in 7 or 8 rounds (9 at most if she put up a wimpy Inertial Armor and only does 5 PP powers, not 6 PP ones). It takes 10 rounds for him to go through his top two levels of spells.
6th level Sorcerer, 5 rounds to go through top two levels of spells.
6th level Wizard, 7 rounds to go through top two levels of spells.
6th level Specialized Wizard, 9 rounds to go through top two levels of spells.
6th level Druid, 7 rounds to go through top two levels of spells.
6th level Cleric, 9 rounds to go through top two levels of spells.
Plus, all of these classes still have their zeroth and first level spells remaining. And, more importantly, most of their attack spells (and many other types of spells) automatically scale with level whereas the Psion's powers are scaled only with Power Points. That means that even their low level spells are "at their best" at all times.
6th level Warlock, infinite number of rounds to go through his spells.
I think you are seeing an advantage where one does not significantly exist.
Example: A 7th level Sorcerer (or Wizard) casting a first level Ray of Enfeeblement does 4-9 points of Strength penalty with no save, but needs a ranged touch attack. A 7th level Psion with Ego Whip does 2-8 points of Charisma damage if the save is not made, but it costs her 7 PP. For her, it is a max PP power. For him, it is a low level spell. One uses a first level spell, the other uses a second level power and augments it to maximum PP for less damage in a less useful ability score.
His lower level spell was still as good or better than her going full bore with a higher level power.
He can Empower his Ray of Enfeeblement as a third level spell (i.e. max level for him) and it does 6-13 points. She can Empower hers as well, but it costs 5 PP and does 1-6 points in that case (since she cannot Empower beyond 4 PP). Even at 9th level, Empowering Ego Whip only brings it up to 3-12 points, still less than his third level spell at 9 PP.