The place where a P-device is liable to be needed is when the device is close to the positive supply rail.
The reason is that to use an N-device, the gate is referenced to the source terminal (where electrons enter). The gate needs to be pulled a few volts higher than the source terminal. The simple way to arrange this is if the source terminal is grounded, or has a clear path to ground at that time.
To use a P-device, the gate is referenced to the terminal where electrons exit. The gate needs to be pulled more a few volts lower than that terminal. It's easier to arrange this if that terminal is at the positive supply rail, or has a clear path to V+ at that time.
The above may be a consideration in constructing a charge pump. As the capacitor charges and discharges, it can create volt levels that would throw off operation, except if you're careful as to which polarity device you install next to which capacitor.