Not a huge reason why you couldn't. There's some differences in current and voltage resolution; PD does 20mV increments of the voltage and similar for current,

Not a huge reason why you couldn't. There's some differences in current and voltage resolution; PD does 20mV increments of the voltage and similar for current, depending on the mode you ask for; and QC 3.0 does it in 50mV and 100mA steps IIRC. So you'd have to round up for the current and hope for the best with the voltage which would likely fine, cable losses would be more than the differences in steps. But that could result in less accurate regulation and such on the other end if it jumps too much and causes it to then request a lower voltage until it drops the next step.