Earlier quoted context omitted.
I have seen more than one PI at an R1 universities with multiple Nature publications use this heuristic. I would not call them incompetent.
Do you not notice the circularity of your reasoning here? Also I didn't say incompetent, I said "not very". More competent researchers make journal rep only a very small factor, and it is not via the "high rep = more trustworthy" direction (which is the bad heuristic), it is "pay-to-publish journals = not trustworthy" (better heuristic). Once you have ruled out a publication being in a trash journal, reputation is on…
I have personally seen highly talented and successful researchers use the heuristic of journal quality when looking at the state of their field. These people are highly competent by any standard. If you want to play word games with negation you could say they are not not very competent.