For me, the major impact of procgen is not the effort or cost, but the translation of skillset. I can handle gigantic, difficult algorithm design problems, and still maintain engagement and happiness. If I have to do even rudimentary art or level-editing tasks for any length of time, I quickly become miserable and quit.

Although, I do also happen to believe that ultimately, procgen has much more absolute potential than hand-made content. Minecraft is only 6 years old, and imo people have barely begun to expand on the basic concept.