Not really a UX issue but I have for years tried to fit everything into '3'.
For example if someone on my team asks a question I'd like them to propose 3 answers / options to me. I always say that if they can't think of three options they aren't thinking about it 'enough', and if they come up with 5 or more options then they are thinking too deeply and I look to group some of those options together as nuances of a broader option.
So for example, when we had all the Follow & Tracking problems a year ago, and back again now, my categorisation was that content fell into:
- I'm not interested in it
- I'm vaguely interested in it
- I'm very interested in it.
I can quickly pigeon hole stuff into one of three boxes, but if the number of boxes increases much my ability to quickly deal stuff out slows.
I hadn't seen the article before and code it a 'vaguely interested'