Frankly, I am allergic to the idea that tourist guides are a necessary step to turn a novel's inspiration into a trip.
When a TV series makes you want to visit the English countryside, you go on Google or YouTube, you don't necessarily rush to a paper guide.
The idea that this changes anything for my wallet or my concrete actions is a marketing myth if the fiction itself already details the places.
To prove their value, guides must offer something that the web cannot, like offline reliability in remote areas, not just be a systematic byproduct of inspiration.