Once two people are involved in a discussion, they normally follow each other on the general area, and this is reasonable and expected; it's only wrong when they start following everything unrelated each other may also work on.  As I personally work on many different things, I myself often do not follow up as much as I ought to, nor can I always respond immediately, and I am always grateful if someone suggests I may want to take another look. If they've asked me too often, I tell them.  '''''' ( talk )