Plugin is not promoted as having support for all LaTeX features.
The main goal of the plugin is formulated in description: “Insert formulas & graphics in the posts and comments using native LaTeX shorthands directly in the text.”
Plugin is focused on supporting math/graphics-related functionality of LaTeX, omitting text-related formatting, etc. In this regard, “incomplete” and “not full-featured” is a bit overstretched complaint for having no support for textual features (like tables).
P.S.
Not all of LaTeX textual features are convertible (nor have sense) in HTML/Web context. Besides these features must be converted to HTML without using the images or graphics (for better search performance).
