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?
You can buy a small Bluetooth/3.5mm adapter. I have one for my amp when I want to play music through it. It also works with earphones. It’s about the size of a credit card but obviously thicker.
… and requires you to use Bluetooth headphones that you have to keep charged…
No. It has a 3.5mm socket. You connect it to your phone via Bluetooth and plug in your headphones.
Then where does it get power from?
It’s rechargeable.
If they mean what I think they do… There are Bluetooth ->3.5 “adapters”… E.g. Bluetooth source (phone), analog output (headphones). Logitech has/had one and it works well.
https://www.sony.de/store/product/sbh56ru-b/Bluetooth-Headset-mit-Lautsprecher-SBH56-Frei-sprechen-Gestochen-scharfe-Selfies that’s what I mean. It has it own dac and works as a middle man between phone (bluetooth) and wired headphones