The pressure to publish tends to lead to many smaller papers, instead of, say, a longer monograph that collates it. Indeed, multiple publications are often made

The pressure to publish tends to lead to many smaller papers, instead of, say, a longer monograph that collates it. Indeed, multiple publications are often made using parts of the same data-set (given how much effort and cost it is to run a study, there is often an incentive to get more data than less, particularly in the clinical and psychological sciences). It is unfortunate in many ways (not all).