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yoast yelling red is just yoast being yoast. images are not a ranking switch, they are a usefulness switch, and google cares more about intent match and time on page. if the article answers the query cleanly, a stock image adds nothing, but one simple chart or screenshot can bump scroll depth by 10 to 20 percent which helps indirectly. i usually add one lightweight visual only when it explains something faster than text, and ignore the red dot the rest of the time.
