Also, that was not a broad consensus. Most researchers had hopes that more disease markers could be identified (and to be fair, some have been), but especially folks working more closely in the areas of physiology were highly skeptical about the benefit of such an approach. In these communities the complexity of biological systems is very apparent. There is a big differences in what one sees in the news and popular science publications as there you need to find grappling headlines.
Saying that "stuff more complicated, just as some folks expected, but others hoped it wouldn't be" somehow does not quite engage the public.
Exactly, this is a bit of a dirty secret for studies that primarily generate minable information. We really do not know what we get (otherwise we wouldn't need to look), but it just sounds so much better if it is linked to something the public understands. A running joke is that everyone is somehow curing cancer.