You don't need 3 dongles if you want to use wired headphones and charge at the same time. There are 3rd party adapters that plug into a lightning port and allow you to plug in a 3.5mm headphone and lightning cable for charging directly at the same time. There are cheap versions on Amazon.
It's like 3 dongles if you want to be able to charge and listen at the same time. Like, for example, on a long-distance flight. And it's a completely self-imposed limitation on Apple's part!