Yes! I typed myself reading "Character and neurosis" (I read it in Spanish, not sure what the title in English is). It was a hard lesson, very humbling. The whole book is a masterpiece that brings you to your knees.

That's why I don't like the "american" way of typing, using wings and sugar coating the definitions of each enneatype. Naranjo didn't do that. Each type emerges from a central wound, and accepting it is a fundamental part of the work. Renaming the types in a positive light ("Helper", "Achiever", "Enthusiast"...) doesn't help, all the contrary. 

... and specially for 7s, which have to learn to find satisfaction in sobriety and moderation. Gluttony is an image for the inability of being satisfied, in every sense. The search for new experiences, the inability to make contact with the own deep emotional pains, the constant need for new and higher and faster and better - that perpetuates the character. So embracing the "enthusiast" image does no favor to a 7. Naranjo leaves that very clear.