In qualitative interviews, perhaps some subjects will say they frequently choose new and less-proven or less-personally-known frameworks because they're looking for greater advantage (which I think is often true).
But how many subjects are motivated to add frameworks simply because they are (or might) become good things to have on their resume, regardless of risk to their current employer (also often true, at least in the US, I think)?
Would researchers' focus on perception of risk (to the project?) miss this motivation, and be trying to fit the wrong psych quiz questions to the wrong models?
(Alternatively, the researchers appear to all be based in Japan, which might not have US dotcom prevalence of short-term job-hopping, so perhaps their results are more applicable there than in the US?)