This review is not structured in the usual way - a departure from tradition that merits an explanation. Literature reviews generally have a linear, often chronological structure, with attention to ‘who was first?’ The tone is apparently objective and decisively authoritative: ‘this study demonstrated that …’. The goal is to present the objective truth about what we’ve learned. The result is an enlightenment tale of cumulative progress, as one ‘original’ contribution after another builds a deeper and broader understanding than was available before. In a traditionally structured review, intellectual differences of opinion are usually handled with indirection and tact, an approach that helps scholars co-exist in a close-knit field while continuing to …