Sorry, it wasn't clear from how I asked the question but I wanted a 2 sentence summary.... Gwern's FAQ is a monumental piece of work but the question is if it is even worth reading 50k words long document about it?
Not unless you have ADHD or another condition plausibly exacerbated by lack of WM, or an interest in meta-analysis.
The appendix, however, is of interest to all LWers who read medical or psychological studies (which is a lot of them).
If it's worth saying, but not worth its own post, even in Discussion, it goes here.