Feels like the iPhone could use a micro SD card at this point. If I'm gonna use a phone as a cinema camera, shooting 4k and 48 MP stills I don't want to be clogging up my bandwidth uploading a ton of footage to iCloud when I'm probably going to cut it in Premiere or something on my desktop.

My drone is like this — it has an internal hard drive, but it's way more flexible and convenient to shoot to its optional micro SD card.