The latter. There is no logic behind it. It's like trying to play Contra, while on fire. Except that would be easier.

It's more of a "You can't win, and if you did, congratulations, Touhou is too easy for you."

Seriously, beating the Doom Roguelike should mean some guy should knock on your door and hand you $50,000.

I love roguelikes, but when Omega (One of the hardest, if not the hardest Roguelikes there ever was, long dead) is easier than your roguelike, you're doing it wrong!
It's like making a roguelike where Skeletons are resistant to edged weapons.