Why do mahjong sets come with extra flowers?

Why do mahjong sets come with extra flowers? From the founding of the National Mah Jongg League 70 years ago (in 1937), the NMJL treated flowers as jokers (wild flowers). Beginning with the 1943 card, more flowers were added to increase the luck ratio and to allow for more challenging hands.

From the founding of the National Mah Jongg League 70 years ago (in 1937), the NMJL treated flowers as jokers (wild flowers). Beginning with the 1943 card, more flowers were added to increase the luck ratio and to allow for more challenging hands.
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