Given that most newer laptops (and phones) support charging via the same USB-PD standard (via USB-C) I don't see the reason for including yet another power adapter in the box when the average user probably already has enough of them at home.
I charge all my laptops (Macbook Pro and a Thinkpad) and my phone (Pixel XL) via the same Apple USB-C charger. I'd rather not have yet-another-charger that I'm not going to use included in the box of my next laptop/phone.