The person said they were forced by necessity to move the MacBooks to USB-C in 2015 and brought up Lightning as the reason. That’s not even remotely accurate. I don’t see how anything is relevant after that. USB-C as the only ports on laptops was never a necessity, it was a choice they made, which they have since rolled back, further showing it wasn’t a necessity. Having the option to also use USB-C to charge doesn’t mean anything. And as I recall, USB-C is slightly underpowered for charging the high end laptops, so if they were working hard on USB-C, there would be some battery train to cover the gap. Not exactly a selling point for a power delivery system.