And even then it’s probably not a hard rule as much as a good heuristic: the older a source is, the more careful you should be citing it as an example of current understanding, especially in a discipline with a lot of ongoing research.
If somebody did good analysis, but had incomplete data years ago, you can extend it with better data today. Maybe the ways some people in a discipline in the past can shed light on current debates. There are definitely potential reasons to cite older materials that generalize well to many subjects.
And even then it’s probably not a hard rule as much as a good heuristic: the older a source is, the more careful you should be citing it as an example of current understanding, especially in a discipline with a lot of ongoing research.
If somebody did good analysis, but had incomplete data years ago, you can extend it with better data today. Maybe the ways some people in a discipline in the past can shed light on current debates. There are definitely potential reasons to cite older materials that generalize well to many subjects.
Well said. :)