Suppose I type a line into a file, and then I ask you what I just did. If you answered "You updated the contents of the file from <complete contents of the file

Suppose I type a line into a file, and then I ask you what I just did. If you answered "You updated the contents of the file from <complete contents of the file> to <complete contents of the file>", I'd look at you like you were insane. An actual human would answer "You added the line <blah> at position <blah>", or "You added the line <blah> after the line <blah>", or similar. So I claim that very small changes are obviously thought of as diffs. And what is a large change but a composition of small changes? Pijul's model naturally represents the process of creating a change - you could slice up the diff as small as you liked without anything about the mental model changing, down to individual keystrokes if need be - whereas Git's model gets more and more unnatural when you do that.