Sheesh.
Most people bring along guidebooks and use them as you describe because it makes sense to do so. Most people don't want to spend the time to drive to their destination crag in order to blindly flounder up some unenjoyable chosspile, aborted 5.15 project, or merely mediocre grovelfest. Using the guidebook as a reference allows people to make informed decisions about what they are climbing, and to find something within their ability to climb. The idea that this is somehow detrimental to the climbing experience seems backwards, wrong, and stupidly puritanical.
As for the green chalk route names and ratings, sure, it sounds kind of stupid, especially given the apparently obvious route layout. At least it was in chalk, though, and not paint. And DFA has encountered similar use of chalk or black charcoal at Maple Canyon, which is quite helpful at crags with many new routes that are not in the book or with routes that have different starts but share anchors or whatever. It helps spread the word, and when the word is spread, the chalk or charcoal can easily be brushed off. Not the end of the world!
Like any other practice, moderation and forethought go a long way.