The blind hero trope forces the story to find new ways of solving problems, and that's where the real strength lies. It's rarely about supernatural echolocation or Daredevil-style radar sense, though those can be fun. The core appeal for me is the narrative shift it creates. The protagonist can't rely on visual cues, so they have to become hyper-aware of sound, scent, temperature shifts, and even the texture of the ground under their feet. This makes the worldbuilding incredibly rich because the author has to describe the environment through these other senses.
A blind hero's most powerful moment is often when their perception, which the reader has been trained to understand, reveals something the sighted characters missed. There's a fantastic scene in 'The Legend of Eli Monpress' where Eli, who's not blind but the principle applies, identifies a forged document by the smell of the ink. That's the kind of detail a blind protagonist would excel at. Their strength isn't brute force—though many are skilled martial artists—it's an unparalleled depth of attention.
Beyond the practical, it's a metaphor for insight versus sight. They often see the truth of a person or situation more clearly than anyone who can look. That contrast is endlessly compelling.