First of all, I have to praise your excellent contribution "O Poder da Revisão como utilizar a memoria a seu favor...", your beautifully made your point and one couldn´t say otherwise.
I had (and still have) the impression, though; that what Charles meant in his initial message is that moment in which one thinks he shouldn´t be (here just some examples/probabilities) be writing or talking because he should recap some grammar points etc.
There is a point in the apprenticeship in which we get that feeling that we "don´t everything" or "don´t know enough" to communicate.
To cite a few examples, say, there´s this book English Grammar in Use with 145 topics on a string of subjects, along with a lot of exercises...to communicate well should I care to master every grammar point there? no! And even if I did, then the "language of streets" would throw me off the track.
And by the way, as you have pointed out, we recapitulate things all the time, when in doubt, we get back to some reference book, grammar or something to get it right.
In fact, the more one uses his English (spoken, written, etc) the more this learner is being corrected ''right off the bat", rather than later, or then he/she is going to correct himself (since in chats or in spoken English, things are real fast...). In such event, generally, the other person is not going straight to the point (to this point- of pointing your flaws- at risk of harming the flow of communication itself.) So, to a certain degree, certainly that´s what "iamcr" was thinking about at the time of his comment here.
To be honest, there are mainly two types of English learners, the aficionado that uses English in a daily basis (reading/speaking/writing) and the one that needs English as an academical subject or to other purposes (say, to pursue a promotion at the work, or to travel next year, or to take a test, etc.).
My comment was more directed to the former, but then I completely agree with you if we think of the latter.