In SEO, some techniques work for a while until the search engines (Google, mostly) decide to do something about the issue, and the technique no longer works.
Still, people who don’t do SEO might not be aware of the change, and they might still do SEO based on obsolete practices.
For example, keyword stuffing. Or use lots of keywords (later on, transformed into adding lots of blog post tags). Or trying to show content visible only to Google. Or manipulating backlinks. Or adding <h1> to the logo. Or bolding things just for Google. The list could go on.
Similarly, there were some practices in the past in the church that are no longer true today. People’s minds might be difficult to adapt to the new realities.
