Just another way to make money, under the pretence of saving the environment. So we now have to order a new cable, a new plug and a new pair of ear phones - three different boxes, packaged in another box and delivered by another van on another occasion. How does that save the environment?!
2022: buy 1 phone, 1 charger
2025: sell 1 phone, buy 1 phone
2028: sell 1 phone, buy 1 phone
2031: sell 1 phone, buy 1 phone, 1 charger (the other one stoped working)
2034: sell 1 phone, buy 1 phone
2037: sell 1 phone, buy 1 phone
2041: sell 1 phone, buy 1 phone
2044: sell 1 phone, buy 1 phone, 1 charger (the other one stoped working)
2047: sell 1 phone, buy 1 phone
2050: sell 1 phone, buy 1 phone
2053: sell 1 phone, buy 1 phone
So during a 30 year period you only bought 3 chargers and only 3 chargers were produced. If it was included in the box, 11 chargers would have been produced.
There's your reduction in carbon pressure.
And you don't even need to have one charger dedicated to iPhone. Since it's USB you can share with iPad, Apple Watch, Macs and PCs (depending on the charger), Android phones and tablets and all other devices which supports USB charging.
Let's say you have 10 devices in your household which uses USB-charging. You could buy 2 or 3 chargers to charge all of them instead of having one charger included with every device.