That is already the case though. You can disable wikis, projects and issues and if you do so they will not show up. Granted it is kind of opt-out rather than op

That is already the case though. You can disable wikis, projects and issues and if you do so they will not show up. Granted it is kind of opt-out rather than opt-in, but I think that if you are starting with GitHub it is better to see what is available and if you are experienced you know what to do to hide them. In the end I disagree with the author that gratuitously hiding stuff under some submenu is good if there is no need to save space.