Board Thread:New Features/@comment-126761-20161201193306/@comment-5811199-20170118062811

They're good to a certain extent on mobile and tablet, because there's limited real estate and you might want to display content first than navigation. Fandom already uses a hamburger menu for its mobile sites.

It's a matter of testing out which format is better at achieving their goals - maybe they want to have more clicks into further content, or put emphasis on links within the article to continue going around the wiki.