The example of a pencil for manufacturing complexity is a good one, but the lesson applies equally to many things. How do you make the ink that fills a quill pen, or the reed pen that it replaced? Do you know many dark, flowable substances? How about dark, flowable substances that dry tack-free and don't fade in a years time? Do any of them work on leather as well as on paper? What if you want a color other than black?
While graphite wasn't mined until medieval times, the pencil is not modern. The idea dates to at least the Roman era (there's a reason pencils have a "lead"). Still, the essay I linked is a great example of how something as "uncomplicated" as a modern pencil actually requires a great deal of knowledge and access to various materials. It's not that it's not worth the time- it's more that no one person can do it all. That's the message I've heard for skills in this game, and I hope it comes to fruition.