The criticism of brew's instructions is warranted to be completely honest, they could certainly word that one sentence a little better. But the way I interpreted the parent comment is that it makes Fig employees appear less capable because they don't understand intricacies of the shell, but as I described in my other comment, not everyone has to be an expert of the shell. Brew is not a "power user" tool, it's a package manager for macOS. Instructions should be clear for all types of users.