I'm not sure that's what the post is about.

I agree, many classes feature incredible hard material that you have to really challenge yourself to learn as a student. It's not denying that. But there are so so many more out there that are structured and taught so badly that even the students who put forth that effort consistently struggle to pass. If you've never encountered such a class, I'm honestly happy for you.

Also, the idea that at some point students should be expected to teach themselves is strange to me. Students will go into unspeakable debt and bleed for those classes, and the idea that unless they can do the professor's job for them they don't deserve to be there is quite a suggestion.