It is an insult to transparency if this isn't done, in my honest opinion.
If there is a claim being made, I want to be able to access the original study that made the claim, see how they came t that conclusion, and assess the validity of their findings.
Did they use the right statistics test?
Did they account for the right controls and confounding factors?
How big was their group size per condition?
What other tests did they use to strengthen their results?
In my honest view, providing direct sources in this age of information would significantly help not only the review process,
but also enlighten the public to know how we achieve the policies we do.