I don't think you are quite getting it.
Chuck is saying that someone who simply follows the text book and doesn't actually do any teaching, just lecturing, is a poor FI.
You are saying that an FI who doesn't do any teaching, just critcising is also poor.
You're both correct, but I think you are misunderstanding what Chuck is actually saying.
Slavish devotion to a system, is poor teaching. Any teacher who has even a modicum of talent knows that sometimes you have to think on your feet a bit and do things differently to what the manual says. Teaching people is not like following a checklist. It is a good idea to have a checklist to ensure that nothing gets missed, but sometimes the order of that checklist can be adjusted.