In particular, while I thought gwern's article was awesome, I didn't have anything to add to it, nor did I see any obvious thing I could do about the issue.

I thought it was pretty obvious that even if you had nothing to say about it or to add to it, the information would: lower estimates of medical progress, by contagion lower general estimates of progress and the Singularity, and as further ramifications, raise the values of cryonics, intermittent fasting, caloric restriction and other methods of extending longevity - all of which have pretty well-understood 'action' items.