How do you imagine walk and work particularly in the studio? You either seat or stand there.
I think we have to see a bold solid line between entertainment and serious content production.
PS: the best headphones on a market for monitoring - Audeze (for instance LCD-3, LCD-4) are still utilize 6mm straight jack.
Amazing. High end professionals might go and buy a USB to 6mm jack converter. Imagine that.
A 6mm hole in a MBP is unrealistic. So why not make it available via USB-C! Wow!
A company might even go out and design a USB-C to gold-plated 6mm adapter dongle with a state-of-the-art A/D converter and make a few quid.