Fahey is a sort of touchstone for me. I learned a bunch of his early shorter pieces when I was first starting to play and it helped me get to the next level. When I get frustrated or bored with stuff I'm working on I go back to Take a Look at that Baby, Spanish Two-Step, I'm Going to do All I Can For My Lord, Poor Boy, In Christ...etc. and play them in that straight forward, deliberate manner that he favored and I found so appealing.
Somebody used the word "disjointed" and I think it does describe his later, longer pieces some of which could be pretty boring, to me.