[misja111]

> One such people screwed my career development for 7 years

The problem was with this person, not so much with the GoF book. In present days this person might have become an FP fundamentalist and come up with some exotic category theory quiz question that he was very fond of himself. The GoF book is now of course outdated but the idea of categorizing best practices from the industry was a good one. Unfortunately many good ideas will be abused by people who lack the common sense to know how and where to apply them. A similar thing has happened to the agile software development movement, to microservices architecture (every service is a microservice?!), unit testing (people trying to reach 100% coverage).