I think you are being blinded by your bias, yes.
If you, the web designer, insert a link to your site into the footer of all the sites you design, that is not an editorial link. It's not a link that the site owner created of their own volition because they think it's valuable content. In fact, if a company is hiring an outside web designer, they might have no idea how to remove the link from their footer. They might not even notice it.
The search engines know all this, and it's why they don't like footer links. They are well aware that web designers, Wordpress theme developers, and so on have been using this technique for years.