Because being able to spam them defeats the purpose of normal attacks and makes the game much more monotone (only one button). The game should not have enabled players to do so, but since it is provided, there's not a real reason one should not abuse it. The same goes for 'would', because 'would' and 'should' is practically the same in this context.
In other words, melee weapons with lower PP is a good thing in my opinion.
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