Why should it indicate difficulty and not easiness? A similar feat would be completely beyond me in math. Even though I minored in math as an undergrad, I have almost no understanding of the questions and arguments being discussed in the professional mathematics literature. I'm never going to stumble across one of my personal ideas in the Annals of Mathematics. It requires so much dedicated time and effort to even understand what is being said.
The professional philosophy literature, on the other hand, is much more accessible. Philosophers treat familiar questions like "Do we have free will?", "What does it mean to do the right thing?", "What does it mean to know something?", etc, in a qualitative manner. After a minimal investment to understand some of the jargon, most philosophy papers are quite readable. It's the kind of enterprise that a layman might actually be able to make an intelligent contribution to.
The professional philosophy literature, on the other hand, is much more accessible. Philosophers treat familiar questions like "Do we have free will?", "What does it mean to do the right thing?", "What does it mean to know something?", etc, in a qualitative manner. After a minimal investment to understand some of the jargon, most philosophy papers are quite readable. It's the kind of enterprise that a layman might actually be able to make an intelligent contribution to.