introduced in Animal Crossing: New Horizons' Happy Home Paradise Buy Animal Crossing Items expansion (which is quite a mouthful), looked a bit... duff. After all, why would you want to make our furniture sparkle?
We thought the same thing too, when we first unlocked the ability to polish. For the mmobc.com first few days (or house designs) the polish feature did exactly that: made things sparkle. And we didn't necessarily want things to sparkle.