I have ridden nearly all the roads in this route, although long before it was born, and really enjoyed cycling the area. The ACA scouts are all seasoned bike tourers, which may explain their preference for the scenic over the short. I trust them, and recommend you do as well.
That said, we all leave the route when we have specific local knowledge or some special destination. Second-guessing the scouts from a distance, though, generally leads to second-best results. Go ahead if you like; it is not likely to be fatal, just time-consuming. "Oh, young man, that bridge has been out for years."
Roads do change, and Irene caused massive damage in the Keene Valley area last year, now all repaired. ACA welcomes and often uses suggestions for improvements from the locals. About five miles of the ADK route and somewhat more of the Green Mountains Loop began with me. Please send corrections and suggestions to the map correction form linked on the ACA home page.