Premium themes often come equipped with a built in SEO functionality that could be used to replace the very popular All in one SEO plugin or any other SEO plugin.
This functionality is often listed as an advantage on the theme’s feature list. “All our themes now include SEO options to help propel your site’s search engine ranking”. Once you install the theme you can use the theme’s built-in SEO functions and input boxes for title and meta descriptions.
So what is wrong with that? Well, as long as you are using the same theme, there is nothing wrong. But, if you are like me and you like the amazing flexibility of WordPress that allows you to change the look of your site within minutes by simply installing a new theme, keep on reading.
Every theme uses it own way to store the information you enter into the SEO related fields. If you chose to change the theme, you can lose all the work you have done. In the best case scenario you are aware of the problem and can fix it by moving the information manually. In the worst case scenario, you could forget all about this and find out few months later after noticing your traffic as gone down.
On the other hand, if you use a generic SEO plugin, changing the theme will not impact your data at all. As simple as that!