I think it would be particularly valuable to tell the author (and the rest of the Forum) how you think reading the post created impact. More concrete / personal examples might include: I am more likely to donate to X / using Y strategy because I read this post, or I will be more likely to advise people who come to me for career advice to do Z. I think many potential authors may be wondering whether the time spent writing actually produces impact in comparison to the counterfactual uses of their time, so feedback on that point should be helpful.
I think it would be particularly valuable to tell the author (and the rest of the Forum) how you think reading the post created impact. More concrete / personal examples might include: I am more likely to donate to X / using Y strategy because I read this post, or I will be more likely to advise people who come to me for career advice to do Z. I think many potential authors may be wondering whether the time spent writing actually produces impact in comparison to the counterfactual uses of their time, so feedback on that point should be helpful.