> Just by adding USB-C they will sell a lot of them.

I have a hard time imagining that would factor into many people's decisions, and if it did it might actually be a negative.

If you already have an iPhone, you already have Lightning connectors everywhere you need them regularly. So upgrading to USB-C means the hassle of replacing or finding Lightning->USB-C adapters for existing cables/docks/etc.

USB-C is mostly a small benefit for people who have never bought an iPhone before, but it's such a small change I can't imagine it actually being the reason anyone would switch from Android to iPhone.

N=1 but I am long time Android user going back to the Nexus era and bought an iPad Mini and iPad Pro entirely due to the USB-C switch when I wouldn’t have considered them before. I’m pretty committed to the Samsung ecosystem but a USB-C iPhone would actually make my next phone purchase competitive instead of Android by default.

Having one cable to charge everything is too convenient for me to give up.

> USB-C is mostly a small benefit for people who have never bought an iPhone before

I disagree. It benefits everyone who has a recent MacBook or a recent iPad. Apples chargers are all USB-C on the other end.

If they switched, the only current gen remaining device without would be the Airpods.

You're forgetting the accessories ecosystem.

I have a stereo dock that's lightning. An iPhone stand/dock that's lightning. A car charger that's lightning. And a backup power charger that's lightning.

If I upgrade my phone to USB-C I've got to figure out what to do about all of those. (And they're all used exclusively with my phone, connecting with any other Apple device doesn't even make sense.)

While the fact that my MacBook charger is USB-C is irrelevant since it's always plugged into my laptop.