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Originally Posted by justanobody So the only way to explain out this arbitrary restriction is that the powers are magical in nature, and each person only has so much magical energy in their "power pool". |
That is NOT the only explanation. Phaezen presented a perfectly reasonable explanation of how this system can represent real world combat styles.
In 3.x, the fighter would take a feat that would let him do a cool move in a certain situation. That situation might come up once a fight, once a day, or once in a blue moon. It was up to the DM how often the character was in that situation, and thus how often the power could be used.
4e just lets the player learn an exploit, then say at reasonable intervals "I see an opening to use my cool move now." It empowers the player.