The point is that it will presumably take less effort to just place your phone onto the wireless charging pad and just lift it off the pad when you are done,
Vs plugging in a cable into your phone to charge it, and then unplugging it when you are done charging.
Your usb-c charger should be directly plugged in to the wall socket, unless you are running it off a multi-socket extension.
It's up to the user to decide whether this is worth their time and money. For me, I admit I do find wireless charging more convenient than wired when charging my phone overnight, and Anker-brand wireless charging pads are dirt cheap on amazon, though I suspect the extra heat produced this way may have led to my phone's battery capacity degrading a little faster than it would.