I've just go trough with your line " (not to mention the subdomain is usually far lower authority than the primary.)" so I want to know you are talking about Domain Authority or Page Authority?
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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.