LOL, you're confusing nothing? A direct quote from you, a supposed blogging expert:
"Oh really? Then tell that to Matt Cutts of Google who clarified in 2009 that meta tag descriptions are no longer used by Google."
Matt Cutts never says they don't use the description meta tag. He said they don't use the keyword meta tag. You seem to think description = keyword or don't have a nuanced understanding of these systems. You then proceeded to post all this evidence about the KEYWORDS meta tag, which is unrelated to this discussion, since the KEYWORD meta tag is different than the DESCRIPTION meta tag. My advice to you is to learn more about SEO and blogging coding techniques because only then will you actually understand what is going on.
Nice backtrack too on your part: "I am well aware that Google may use some meta description data in snippets "
Is it nice being a posuer? Of course it's possible to set up meta data file information for each site to be edited. WordPress has just chose not to code that into their system for their users. If you are saying this isn't programatically possible, then you are even more out to lunch on blogging then even your last gaffe leads one to believe.