I don’t think the fourth point was necessarily that photos shouldn’t be post-processed; while worded a bit extremely, I took it as more of a “get it right in the camera rather than relying on post-processing.” I’ve noticed a huge difference in my photography since reading a quote by Zack Arias, “If you find yourself out shooting a client and you’re saying in your head ‘oh, I’ll just fix that later in Photoshop’ stop what you’re doing and slap yourself as hard as you can.'” I think that’s more what the 4th point was saying…But that’s just my take on it.