Yes I totally fell for that FSI 800 hrs. myself. Totally. Until Peter Mollenburg set me straight. And yes I totally agree with your summary.Ignuanamon
This notion that spending 800 hours should make a learner C2 is erroneous
Maybe part of my learning curve has been the realization that things are not what I thought they would be when I started out. And yes, I even fell at the beginning for Benny Lewis' Fluent in 3 Months: How Anyone at Any Age Can Learn to Speak Any Language from Anywhere in the World. I mean at the beginning I was seriously ignorant.
Everything that I have learned has been due to the unspeakable kindness of strangers on this Forum. Their generosity, patience, wisdom, and forbearance with my blundering has been incredibly appreciated.
Everyone has their own style of learning. I happen to actually enjoy slow and easy all the while keeping in mind what rdearman said when he mentioned that "language learning is hard work."
Each to their own.