Changing only the wording without reforming the system is just scratching through a boot.
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From Yan Yu's (严羽) Song-dynasty poetics treatise 《沧浪诗话·诗法》: '意贵透澈,不可隔靴搔痒' — 'meaning should be penetrating, never like scratching an itch through a boot.' Originally a poetics metaphor, now general.
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Literal image is almost physical: your foot itches inside a boot and you scratch the leather outside — you can feel the effort, the itch feels nothing. Perfect for 'lots of motion, no effect.'