[nrs5813]

I totally get wireless headphones. The problem is, not every device I listen to music on has Bluetooth. I don't take my phone on runs and I'm not buying two sets of headphones. Not to mention, even when I'm not running, I listen to music on my iPod classic and only use my phone for podcasts.

[kylec]

The Nintendo Switch is a good example - it has a headphone jack but no bluetooth headphone support.

[JBReefer]

It has Bluetooth comms to up to 8 Joycons and a general purpose operating system, so the limitation is probably a lacking audio implementation, not physical impossibility.

[lathiat]

Good news... Apple has the device for you! (the Apple Watch)