I want the source list to be the Finder on my Mac, not "All Photos" on the iPhone. I frequently have 2000+ photos to bring over at once; I hate dragging through all of them to select them, with one mis-touch resetting the selection. I've also found AirDrop to be very unreliable at that scale (does it even work? I've never used it for more than ~a dozen items), and want reliable file transfer functionality that can pick up where it left off if it gets interrupted.