There's certainly a separation of the database (qa-db-*.php), app logic (qa-app-*.php), and presentation (qa-page-*.php and qa-theme-*.php) layers, exactly like MVC, just without the terminology. I don't use a traditional MVC framework since I feel it would be too restrictive for the kinds of things that Q2A needs to do.
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July 25th, 2023: Q2A 1.8.8 released!