Excellent article, I had forgotten about that.
You may also check out the evolution of structure I & II on the PersonalBrain Usage KB WebBrain. WebBrain seems to be down right now, so I can't link directly to it, however, once it's back up you can access it from here. I agree with Antonio68. After your database reaches a certain size it just doesn't make sense to maintain and update all the thoughts when you find a better way to name, tag or type thoughts. Generally I can find 90% of my thoughts using Instant Activate. It's only when I forget the thought name or can't find related thoughts that I have to use Reports and Advanced searching. At that point I ask myself what I could do differently to help me find it easier next time, update the name, link it to a related thought, apply a tag, etc. I usually only implement structure changes on frequently accessed areas. Otherwise I'll update thoughts as I come across them, along with it's related thoughts. It's only when I'm feeling especially obsessive compulsive that I'll update the entire area.