[themoonisachees]

I suspect the usb-PD standard doesn't allow for raising the voltage any more than they already do

[omgtehlion]

Even if usb PD could go up to over 9000 volts, it can only provide fixed set of voltages, none of which can really match what every tip requires

[Ajedi32]

Actually that's not true anymore, PD Revision 3.1 has an adjustable voltage supply mode that can do any intermediate voltage between 15-48v, with a maximum power of 240W: https://www.usb.org/usb-charger-pd

I don't know how widespread support for that is though.

[auguzanellato]

PD with EPR can go up to 48V, 28V support is common-ish.