...You know, I'm surprised there aren't more blind protagonists in books-- it feels like it'd be the perfect medium.
(Or maybe there are and I just don't know about them.)
One of the biggest problems is how heavily books rely on visual descriptions. It is often a sign of a poor novel when you cannot imagine anything because the author left out visual descriptions, so having a blind protagonist risks mimicking those poor novels. Language has a severe dearth of descriptors and comparisons for smells, sounds, and touch in comparison to visual ones, so it is a lot of effort to communicate a world without sight. I would know, having tried and failed to communicate without some form of visual elements.
Now, you can make allusions to visual elements in order to communicate the other senses via that connection, but it is still mind-numbingly difficult. The pitfalls are numerous.
There are a few nonfiction or fictional biography books with blind protagonists, all of which I have found absolutely wonderful to read. But in fantasy, there generally a lack of such protagonists (that are blind, and stay blind, and do not simply have some other form of sight. It rarely actually matters beyond the cool factor of looking blind, but really, you can "see" better than everyone)