Happy to discuss this, jannes. Your points are well-taken: when we first launched the ability to see why/how results were customized, we added a link at the top-right of the search results (the Search Engine Land article has a snapshot from those days).
But there's another guiding principle that things on the search results page need to "earn" their pixels. Since personalization is a second-order effect and very very few people ever cared enough to click the link and get more info, eventually that link made its way to the bottom of the search results.
But there's another guiding principle that things on the search results page need to "earn" their pixels. Since personalization is a second-order effect and very very few people ever cared enough to click the link and get more info, eventually that link made its way to the bottom of the search results.