&gt; <i>but I actually prefer a simple headset with a 3.5mm mic-in&#x2F;head-out connection. Why? Well, it works always</i><p>I can say with certainty that it does not always work.  If I plug a pair of Apple earbuds into my Android device, the audio up&#x2F;down do not work.  This functionality isn&#x27;t consistent even within the Android device world.  Having a consistent headphone jack that provides consistency here would be a pretty big win.  (Even bigger if Apple gets on board, which it won&#x27;t.)<p>&gt; <i>I guess I can live with it, but having to carry around an adapter from USB to 3.5mm audio will be a PITA</i><p>Pretty sure the endgame here is that your headphones have a USB C connection on them instead of a 3.5mm audio jack.<p>&gt; <i>Next year, USB power cords, and you&#x27;ll have to rewire your house.</i><p>You can already buy outlets with USB ports.  They&#x27;re increasingly common, but thankfully the transformer is in the outlet so you&#x27;re not running low-voltage wire all over.