Fair enough, the logistics of different facilities might allow more leeway in some than others - but in the FC where I work now, they're not very flexible about moving people around unless immediate business needs and stow rates allow it (for indirect roles at least.)

Still, I don't think employees should have to ask at all - Amazon should regularly rotate their FC employees through various roles, even within a workday. Doing so would improve performance, attentiveness and morale across the board, reduce repetitive strain injuries, and give each employee an idea of how various roles interrelate.