What are the alternatives, though? You have old D&D, where you could never reliably do anything special. You could do a Fatigue Point system, which mostly rewards just spamming your one best move over and over. Or you have this AEDU structure, which imposes an artificial limit on how often you can do each move.
At the very least, the AEDU system provides the variety that you would get out of a system that more closely measured the exact circumstances required to set up each move - it emulates the result of a system that would tell you why you can't just spam your best move over and over.