Here are some reasons why: Prevents it from rotting and splitting. It helps in combining the ingredients uniformly while cooking some food that has more liquid content.
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Wooden spoon with hole stock image. Image of household 20104207
The hole in the middle of a wooden spoon helps prevent it from rotting and splitting because the end grain of the wood (its growth rings) is more vulnerable to moisture than its side grain, so having the hole in the middle allows any moisture to drain out.