I read all 3 of your hastily made threads (3 threads in 6 minutes has to be a record).
I definitely disagree with what the 'legendary therapist' is saying. Neglecting a lift because it is perceived to be stressful on the joints (which is categorically false if performed properly) to train a different lift in it's place because it is more of a true 'muscle movement pattern.' Whatever the hell that means.
Every thread you posted seems to be info put out by people that don't want to squat, spewing BS and grasping at straws to make it seem like an unsafe or dangerous lift. Last portion of your third thread hints that you might want to squat more if the DL is too hard for you..still BS though there is more carryover from the squat to the DL than visa versa.
Calling the science-y guys to do a better job at refuting this with actual studies etc.
Arlecc, DrB, Maiou, Tosa, with your powers combined!!....
EDIT: The word function(al) is used 27 times in the article and is posted by "Functional Movement Systems." Don't bother, my head exploded.