Telling people to stop being meta is very important, but I think you may be misunderstanding the way in which Chapman is using the term. AFAICT it’s really more about being able to step back from your own viewpoint and assumptions and effectively apply a mental toolbox and different mental stances effectively to a problem that isn’t trivial or already-solved. Personally I’ve found it has helped keep me from going too meta in a lot of cases, by re-orienting my thinking to what’s needed.
Telling people to stop being meta is very important, but I think you may be misunderstanding the way in which Chapman is using the term. AFAICT it’s really more about being able to step back from your own viewpoint and assumptions and effectively apply a mental toolbox and different mental stances effectively to a problem that isn’t trivial or already-solved. Personally I’ve found it has helped keep me from going too meta in a lot of cases, by re-orienting my thinking to what’s needed.