Prognostication over the presence or absence of a single punctuation point seems like a problem for the reader. It assumes the author has the same background a

Prognostication over the presence or absence of a single punctuation point seems like a problem for the reader. It assumes the author has the same background and understanding of these fine points that the reader does. This is probably an unreasonable assumption. I used to look for these shibboleths and hidden implications from minor stylistic issues. It's a bad habit. It often does reveal much. But it also tends to apophenia - seeing patterns that are not there. And it's so fuzzy that preconception tends to dominate. (You only worry about the abruptness of 'K.' if you're already worried about what they think of you.) As a writer, try to follow the style your audience expects. That advice applies to informal personal communications. But don't engage heavily in this practice as a reader. It can be counterproductive to communication.