He is maybe the only person that has put it together in a way that is easy to understand and deliver across many different training situations.
Have 13 weeks to train for a 10 vs 8, you can figure out how to implement a program successfully.
There is so much out there that currently makes more sense, it just gets super difficult to put in to action. Even if you know a lot about running, it's hard to take a book that just has a bunch of theory and maybe one stock schedule and put it into action.
How many fast runners use Daniel's? Could they be faster on a different type of program?