Nothing ends at philosophy. They reach there, but they can reach lots of different places. Without scrolling on philosophy I can see more than 50 other links from that page that are thus reachable from anywhere by at most one more step.

Pick a random thing and see if it is reachable from anywhere. A lot of them are. I suspect most are, but I don't know how to run this study (other than a brute force algorithm that will use more compute than I would want to dedicate)