"The ubiquitous hamburger icon, used on apps and websites for years, is slowly falling out of fashion on the web."

Strange, Sarah, that you should link to an article to support such an assertion, where the comments make it clear that many users prefer the hamburger.

I am one such user. If I download an app to my Android phone that insists on using a cluttered list of buttons, that's uninstalled pronto and replaced by one using a hamburger. It creates a much cleaner, aesthetic.