A developer has to hold a cogent mental model of the problem they’re working on. Someone copying text might be able to do it while thinking of other things. If

A developer has to hold a cogent mental model of the problem they’re working on. Someone copying text might be able to do it while thinking of other things. If a developer is interrupted, their mental model “pops” like a bubble, and they might have to mentally start from scratch once they’ve dealt with the interruption.