Personal opinion, of course. The following factors are at play. But that chapter makes little attempt to explain how these features actually work or why. But of course, because it is in the CID book, you would be expected to regurgitate such features on the exam, most likely without having any idea of what any of them actually are. So I really question what these chapters are trying to accomplish for the student, except for Cisco to just show off and brag about their breadth of features and equipment.
Cisco holds no monopoly on network design ideas.
Design is still very much a black art, and is therefore very different from troubleshooting. In troubleshooting, either the network communications are occurring correctly, or they aren't. In design, it's really all about making choices among various competing and often mutually exclusive goals. So what would really be useful would be a vendor-neutral network design certification that encompasses all the network design ideas of the industry. But don't hold your breath waiting for it.