Yeah, no. When will I need this dongle? Exactly when I left it somewhere else. Then Apple will need a "Find my Dongle" application next to all the other "Find my*" applications.
I am not going to buy expensive spare dongles just so I don't rage when I realize I left the dongle at work so now I can't listen to music in the garage while I work on my projects. I am not going to carry it around all the time with my phone just in case I need it. The removal of the 3.5mm jack is a failure by Apple.