It's that they, for centuries, could make money composing one.
Today, they cannot make money, but it is a sort of rite of passage in many composer's minds.
To say that they admired chant is inaccurate - for back then they were surrounded by it and many of them made money as church musicians.
We like to think of the church as the great patron of the arts, but she has usually employed Michelangelos and Palestrinas to the extent that her leaders have been able to act like other princes of the world
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