There's an incentive for the work to be right, explainable and having transposable advice.
A common thread I see in discussions about age and about weight gain is about how a lot of it is determined by genetics. If you are trying to sell a diet book, are you going to dig into the genetics part a lot? Probably not![0]
Flavors of this exist in all domains, of course, and it's not that the causal relation is "writing a book on the effect makes the research bad". But when you show up with a problem and the solution in one package, there is a question about whether this is research or whether this is a sales pitch (likely something in between).
[0]: not taking a position on the actual veracity of the genetics back-and-forth.
A common thread I see in discussions about age and about weight gain is about how a lot of it is determined by genetics. If you are trying to sell a diet book, are you going to dig into the genetics part a lot? Probably not![0]
Flavors of this exist in all domains, of course, and it's not that the causal relation is "writing a book on the effect makes the research bad". But when you show up with a problem and the solution in one package, there is a question about whether this is research or whether this is a sales pitch (likely something in between).
[0]: not taking a position on the actual veracity of the genetics back-and-forth.