Ha ! Nah. When we asked why so few of them, he said that it was because it took too much time and he didnt had enough to do it.

Which, either its a lie, or he is doing it wrong. Because the thing that makes time in session go by a lot with few preps is combat. I could design you 3 combats that would last a session faster than any other type of content designed to last as long.

No matter what, I like combat, I like it a lot. And this turned me off a shitton.