honestly, i think cherry picking interesting worlds is way better than trying to detail out the thousands of worlds.. for one, you'd not be able to do any real detail in an every-world approach, unless you want a product larger than several dozen encyclopedia brittanica's. and even then, you'd not be able to get all that in depth.
plus, it would be a ridiculous amount of work. not to mention, the high risk of contradicting existing information by mistake, and the fact that a lot of worlds are, frankly.. not all that important. and the entries would get awfully repetitive too, especially for the not-so-important ones.