Is Batman not a wish fulfillment power fantasy? He’s a playboy, uber-rich, expert in martial arts, an expert engineer, expert detective, and has technology that borders on magic. What’s the term you suggest for characters like that? I feel like we’re arguing semantics. That point is that these characters are not relatable because they’re OP. I mean it’s fine; I love superhero stories. I enjoy power fantasies. But power fantasies are tropey in fantasy (also in superhero stories, but they’re the point there) in a way they don’t need to be. It’s interesting that this trend in fantastic fiction is somewhat recent: Bilbo Baggins isn’t a power fantasy, nor is Dorothy Gale, nor Steerpike, nor Alice. (Maybe it’s The Once and Future King that kicked that off.) And they’re far more relatable because of it. They help us make sense of the fantastic because they occupy the same places in it that we would.
Fitz is central to earth-shaking events and is a royal, a skilled warrior, and a powerful wizard. Bad shit happens to him, yeah. And he’s often (always?) bound by loyalty and duty and love and his own thickheadedness to serve people less powerful than himself. But he is powerful. And his story fits right into the fantasy tropes described above. His arc isn’t substantially different than Rand al’Thor’s or Wart’s or Garion’s or etc etc.