Distinguished historian Keith Thomas writes in the London Review of Books.

Secondly, we must press for changes to the REF, formerly the RAE. In my experience, this operation, though initially a stimulus, has in the longer run had appalling effects. It has generated a vast amount of premature publication and an even larger amount of unnecessary publication by those who have nothing new to say at that particular moment, but are forced to lay eggs, however addled. In the social sciences, it has discouraged the writing of books, as opposed to specialist articles, and by making peer review the ultimate arbiter it has very probably enshrined orthodoxies and acted as a curb on intellectual risk-taking and innovation.