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You have to remember YOU make the world.
The Bestiaries are stat blocks with some flavor to inspire. So, they present a minotaur to use and give you the basics. When you actually run the game, in the world you create, it can be THE minotaur --- a legendary beast at the heart of a labyrinth that an ashamed king has employed the players to destroy for him. If it's not challenging enough, throw on a few levels of Barbarian and make a mid-level party quake.
Succubi can be only THE succubus; a former courtesan who trucked with dark powers for eternal youth and was cursed to seduce victims to their doom to maintain its beauty.
Especially when it comes to big monsters --- "Titans" can become singular; a lone creation of the elemental chaos itself with power that rivals the gods.
They're called source books for a reason. They give you source material to adjust as you feel fit. And if that's not enough for you, the AP's and Revisited books provide plenty of unique, named monsters with full backstories to boot.