Probably like 98% of customers already have a USB power source of some kind, so that seems like a reasonable cut corner.
I think it'd be great if Apple offered a small discount for opting out of unnecessary items.
Androids have their fancy ~100W fast charging where all of the charge controlling is in the brick for thermal reasons and those require special proprietary chargers that become obsolete after a generation, but Apple doesn't do that.
Or they could just include a 20 watt usb c charger with my $800-1200+tax and activation fees phone and not force me to spend another $60 on their power adapter. though to be fair a third party option would certainly be less expensive.