Why is Gerona not mentioned in RS’s travel book?

Rick Steves chooses to cover limited areas, but cover them well.

I had forgotten that; it is an odd omission.

Girona is a very good day trip. The historic center is atmospheric. Part of it is fairly touristy and has lots of restaurants (the city has some highly-regarded restaurants, I believe); the other part is quieter. It has a walkable wall, two old churches, an art museum and a Jewish-history museum.

These days you'll find a lot of web resources using the Catalan and Spanish spelling of the city name, Girona.

I learned today that Gerona is the Spanish spelling. I've always known it as Girona, the Catalan spelling. I've flown from the airport there several times and spent 2 or 3 hours in the old centre once. I'd love to spend more time there now I know more about it than I did back then.

There are so very many wonderful towns and cities in Spain that are not covered by RS.
Same is true for Italy.

Just my opinion, but I disagree that the Rick Steves guidebooks report only limited sites, "but cover them well." I think the books are excellent for a first-time visitor to a site. There are typically suggestions on transportation, finding accommodations, and reasonably complete guidance on places to explore for an initial visit. However, for a long term stay in a site or for a repeat visitor, the Rick Steve guidebooks do not provide extensive coverage. This is not meant as a criticism because these books provide a valuable service, but, in my opinion, they aren't comprehensive and "in-depth" for even those sites they include. .

Anita is right. Consider the target audience for the guidebooks to be American tourists who are looking to make their first and maybe only 2-week vacation to a particular country. You can't cover everywhere. And it takes a considerable amount of resources to keep what they already have up to date.