I actually prefer them writing about a single (or a group of related) field(s) of study. There have been lots of articles asserting that all of science has these issues, but it's not clear to me that they all suffer to the same degree. For example, It's not clear to me that physics or astronomy suffer as from this type of behavior. I'm sure it does happen, but it doesn't seem to be as pervasive as in the social sciences and medicine. For social sciences it seems like it is happening often enough that it's affecting the trajectory of the field. To my knowlege, this isn't the case for most of physics and astronomy (for example).
Also, a lot (but not all) of the "mistakes" noted in the article were deliberate fabrications or unethical tampering of data. So I think labeling them as "mistakes" risks being too forgiving.