Because that, in no way, will prevent researchers from trashing studies until they get the results they want, or fishing for any significant correlation after the fact as if that's what they were looking for all along.

Some sort of validation mark that a study announced itself before being started would at least show me which ones I should ignore - because IMO this type of thing is ruining medicine, esp. pharma.

At this point, there's very little evidence that some major drugs, classes of drugs, and treatments work at all, and that's both scary and a systemic financial drain.