Don’t get me wrong. Apple removing audio jack was the biggest facepalm in smartphone history. And you can thank it for not being able to make an upgrade without sacrificing audio jack (and SD card too :/). But USB-C is getting standardized everywhere now (laptops, smartphones, etc.). What makes USB-C earphones not worth the switch?
With a 3.5mm jack, you need power amplifiers in the source device to provide the amplified analog signal for sound reproduction. With USB headphones, you’re just moving the digital-to-analog conversion and power amps to the end device.
You end up with the same power draw from the single battery, either way.