Publishing research using outdated methods
What you call "an outdated method" another may call "the well-understood method".

In neuroscience, this is a very common occurrence. There are new techniques for analyzing different types of neural recordings coming out each month in a number of journals, and each one aims to improve on a specific aspect of a predecessor. Unfortunately, the new techniques are exactly that—new—and therefore untested against lots of data with different initial conditions. There are a good number of researchers who will simply ignore all the new techniques until people have developed them to a place of comfort. Even for those that do gain acceptance, they may not be appropriate for every type of analysis1.

I'm unfamiliar with your specific case, but I have seen similar concepts elsewhere in Econ, where older published techniques remain highly popular because (1) they're well-understood and (2) the new techniques were created to fix problems that not present in all databases, or not relevant for a given analysis. The old fogies sometimes do have something to offer.



1 In one case, a technique called DCM became widely popular in a very short period of time, and consequently was very quickly becoming widely misused. It got so bad that the authors actually published a paper titled "Ten simple rules for dynamic causal modeling" with the goal of educating researchers how to use the technique. (Biomed researchers in general don't have a great track record of performing world-class data analysis, but thats a separate story...)