Re: Who uses UPnP?
As recently as last year, Running 2x Xbox Ones with 2 players on a home wireless required UPnP to allow them to work properly with group chat running alongside mutliplayer online gaming. It also required that it was implemented properly on the router, most of the cheap ISP provided ones wouldn't work due to poor UPnP implementations, and my housemate switched ISP twice to get it working properly.
But I'd be the first to admit that sort of setup isn't applicable to 99% of users, but you wanted an example...