Galeforce is definitely overhyped by most people as it is in no way needed for any of the content. Given that, everyone here seems to have an incredibly strong bias against galeforce, likely because everyone else thinks it is so good. There's nothing wrong with building a team around galeforce and in many situations your team will be superior compared to a similar setup without galeforce.
Galeforce is incredibly powerful and one of if not the best skill in the game and useful no matter what way you are playing. Although the guide does go a bit overboard, it doesn't really deserve all this ridicule, especially if its specific purpose is to make optimal pairings with galeforce.