This is what I'd imagine most of the people on here would fall into the trap of when the monthly 'I want to quit and work with my hands' post comes up. It's the cliche, I want to disrupt the industry before I even learn it.
My girlfriend works at a bakery and I showed her this post and asked her what she thought about it. None of the bakers need to write down anything or make spreadsheets on how to make a loaf of bread or any of the other products they make every day. This is like having to google 'how to write a for loop' even though you're a programmer.
Bakeries make the same things every day, there's very little change even though as a customer(me) it might look crazy. Knowing recipes and quantities and how to adjust them are the most basic requirements of the job.
Huge props to this guy for doing it though! I hate making negative posts shitting on someones venture. If this is what makes it more fun for him, then keep doing it, and get better.