1) Good job on the topic: it caught my attention. That alone is a considerable feat in a world of information overload.

2) Where's the rest of it? The tone starts out like a story and I was enjoying it up to the rather short last paragraph but there was no "next page(s)" button. I'm sure writing a long technical article can be daunting - but I was hoping the tale you started telling would continue (at least until my coffee had cooled enough to drink)

3) You gave two example rows of a non-1NF table. That's a helpful visualization. The follow up description proposed how one might "fix" the design - another illustration would have been equally helpful. Many readers here are already familiar with NF and table design, however those reading about 1NF might not be as confident with those concepts; some might think fewer (non-normal) tables are "easier to understand."

4) Provide some footnotes linking to more information regarding your apparent dislike for NULL values. I know it's a subject that's been done many times, but the audience reading an article on 1NF might still not have an informed position on it. (hard for veteran DBAs to remember new people enter this field every day)

5) Keep writing. I hope your next topic catches my attention when it crosses my inbox in the future. 🙂