Good read.
I especially like the recommendation of mixing a variety of rep schemes to hit Type I & II fibers.

Anatomy charts that break down the composition of slow & fast twitch fibers show that most muscle groups consist of a good percentage of both.

Training in the 8-12 range may be best for general hypertrophy, but if done exclusively, you could be neglecting up to half the fibers you could be developing in a muscle IMO.