This policy treats the symptom not the cause - it's like scratching an itch through a boot.
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From the Song-dynasty poetics treatise 《沧浪诗话·诗法》 by Yan Yu: 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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The 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.'