AirPods have too much latency for playing music. You want wired audio for running GarageBand or Logic Pro with a MIDI controller. They could have gone with a USB-C to audio adapter, but then you wouldn't be able to plug the MIDI controller and charge the computer.
... Only a few people make music with a Mac, but it's been an important part of its history, and Apple cares about it.
> ... Only a few people make music with a Mac, but it's been an important part of its history, and Apple cares about it.
This seems to be a recent phenomenon. A lot of electronic music production uses the Macintosh and Logic/Ableton workflow, to say nothing about how many of the best DSPs were Apple-exclusive until about a decade ago. I don't really think music production, at least in the EDM and hip-hop world, got popular on the PC until the rise of Fruity Loops and FL Studio, but that's available on the Mac now too.
... Only a few people make music with a Mac, but it's been an important part of its history, and Apple cares about it.