Jillian D'Onfro, writing for Business Insider:
"The feature has long been available on the desktop version, which made its absence on the app even more annoying for those of us (like me) who like to plan roadtrips on a computer but rely on a phone for navigation. Not being able to add multiple stops on the app was incredibly frustrating."
What's similarlly interesting, is that Waze, a mobile navigation app which Google has owned since 2013, has had this same functionality for at least a couple of years now-- even allowing passengers of moving cars to insert a stop into an established route. I really wonder what took so long.