Obvious Answer

Less is more.

Credit to https://www.google.com/search?q=types+of+puzzle+pieces&source=lmns&safe=active&hl=en&sa=X&ved=2ahUKEwilh6LKmsHsAhXVIH0KHTLEBgUQ_AUoAHoECAEQAA for the images.

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