How much a site's themes effect SEO?

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The problem is that most users only think about the visual aspects of a theme, completely ignoring the technical ones. Even more, almost every template out there comes up with the phrase “SEO optimized” in the description, many times misleading the user into thinking it will solve SEO issues for them. while Templates and themes don't affect SEO directly but affect indirectly. such as Ugly Design Can Scare Users Away, Slow Speed Will Bore the Users to Death, and Bad Structure Will Puzzle Search Engines.