It would make since to say something like usb-c is required for up to x volts. Then x-y volts require this other kind of charger.
I mean it’s totally valid if the required technology literally can’t handle certain applications that there needs to a level 2, level 3, and onward option.
Why make yet another standard instead of expanding the existing one? The newest USB-C standard allows for 240W at 48V. That should be enough for pretty much all mobile electronic devices. You could even charge an e-scooter at a reasonable rate. And at the same time, you could still charge your wireless headphones with the same charger because it’s compatible. Doesn’t get much better than that.