It is common, in the so-called "hard" sciences, that recent bibliographic sources are privileged compared to sources dating back several years. This practice is consistent with the notion of the constant construction of scientific knowledge from the knowledge already acquired. An idea as coherent with the myth of the inevitable progress that we associate with Modernity.
In the case of the social and human sciences, however, I have the impression that this tendency to favour in bibliographies recent documents could be the blind application of rules borrowed from other disciplilnes. Sometimes one might even perceive what appears to be a form of methodolatry, preferring recent analyses and discussions on a theme to the detriment of what researchers have said a few decades ago. I often hear the comments "Yes, but this study dates from several years... " to deny the interest of qualitative research using individual or group interviews. I find it hard to believe that the humans of 30 years ago are so different from those who live in 2019. And that newer is always better.
I am looking for authors who have published about that. issue. Do you have any suggestions?