That is a bit more expensive and complex. Looks like this is configured with a couple of resistors for 5v from USB which is simple to get and a voltage reg to drop down to 3v3 optionally. Full PD requires a chip and active negotiation for higher voltage levels. Though there are chips that do that it does increase the complexity and cost and soldering skills a bit. Might not be worth it if all you work on is 5v or 3v3.
Any sort of op-amp circuit would easily make use of a 15V input, or better yet using the full 20V with a 10V reference to get +/-10V voltage rails for an amplifier circuit.
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