Can you answer why? How do you know that they are some of the best designers in the hobby? How do you value who is random and who is not? Can you say if Gary Gygax is a better designer than those who designed Runequest or Warhammer? What is a fantasy heartbreaker? Is warhammer or runequest or ars magica one?
I don't *know*, hence it's called a prior. However, there is plenty of of auxiliary information about the quality of the system FATAL. It is not published professionally, the designers have no track record, there is no one in the whole wide interweb speaking positively about the game and it is very unlikely that I am ever going to be in a game of FATAL.