If more than half the web runs on a content management system, then the majority of technical SEO standards are being positively shaped before an SEO even starts work on it. That’s the lens I took into the 2025 Web Almanac SEO chapter (for clarity, I co-authored the 2025 Web Almanac SEO chapter referenced in this article).
Rather than asking how individual optimization decisions influence performance, I wanted to understand something more fundamental: How much of the web’s technical SEO baseline is determined by CMS defaults and the ecosystems…

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