I work in this area of research. The issue is the headline findings from all of these studies will get reported and people will comment on how it's obvious or offer their own explanation. The truth is that it's a very technical / stats heavy field with a lot of the results depending on the assumptions you make and how you treat the data. The results then have to be qualified with 'there is a positive relationship, given x y and z'. But of course that's usually too complicated to report so all of those details get omitted, and all we are left with is a simple statement followed by hot takes from the general public.