If you have to switch between lightning and 3.5mm constantly, how in the world does buying another dongle help?

This is my biggest problem. Even across Apple's own line, you have iPhones with only lightning ports, and iPads with no lightning ports. If I use headphones across those different devices, I'll have to unplug and replug the adapter constantly. Which means that adapter is going to get lost.

This is all such an unnecessary problem.