Prince Prospero's primary flaw is not hedonism or simple foolishness, but hubris (excessive pride), and specifically artistic hubris.
Prince Prospero was considered to be ruthless, decadent, wicked, flagitious, and sadistic. So, the Prospero was said to be born and raised as a Satanist, and had a very cynical mindset on the topic of faith.
However, the sorcerer image is said to suggest something else. Here, you might say that the Prince Prospero's real flaw is not the hedonism or simple foolishness, but hubris (excessive pride), and specifically the artistic hubris.
Hence, he was portrayed by the late Vincent Price, who is also said to play the Dr. Phibes.
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