Because they're both meaningless buzzwords. But if you gratuitously capitalize them, and especially f you repeat them, often enough -- "Agile, Millennial, Agil

Because they're both meaningless buzzwords. But if you gratuitously capitalize them, and especially f you repeat them, often enough -- "Agile, Millennial, Agile, Millennial, Agile", especially in article titles -- people will not only naturally assume they mean something, but that they're absolutely vital terms to know about, and that is crucially important to stay on top of every facet of their meaning lest one fall woefully and irrevocably behind not only in one's career, but in the current Zeitgeist generally.