USB-C cables are an investment in the future. Apple helped design the USB-C (and associated Thunderbolt spec) and knew that they would inevitably be forced to switch to USB-C. The iPad came first (to make it "Pro"), but the writing has been on the wall since Macbooks started charging over USB-C. There were legitimately no benefits to using Lightning besides the licensing fees that they charged when people made Lightning-based peripherals.
Maybe for you, Lightning cables don't seem like such a bad investment. To me, it's an source of imminent E-waste. The Lightning port on my Magic Trackpad 2 is the only thing that makes it feel dated, and unfortunately the feature that will eventually make it unusable. There is literally zero reason this accessory should have shipped with the port.
