If you're just taking a normal amount of photos and videos then cloud syncing over wifi works well. The fast data transfer rates are going to be most useful to

If you're just taking a normal amount of photos and videos then cloud syncing over wifi works well. The fast data transfer rates are going to be most useful to people recording 4K video, especially if using it for professional projects with more than short clips. Maybe the most important feature allowed by the USB 3 speeds is that iPhone 15 Pro can record directly to an external drive, so you can plug that in to your editing machine and not worry about the phone's internal storage at all. But it's not something normal people are going to do.