Yahoo introduces CSS nocontent syntax

It seems that the creators of Yahoo’s search engine have a difficult time. It’s getting harder and harder to distinguish content from navigation zones on web pages. However, distinguishing can be useful in improving the quality of rankings, as well as displaying more relevant sites in search results. Yahoo has introduced a special CSS class called robots-nocontent. You can use it in elements like <div> or <p> to notify the Yahoo search robot that this part of the page is not related to the main content. In the relevant section of his reference, Yahoo recommends using this syntax in the headers, in the basements, in the navigation sections of the site ...

Of course, I understand the interest of the Yahoo team in the introduction of such an element - it can really improve the results. But it seems to me that most webmasters will ignore this innovation, as happened earlier with the Google parameter nofollow. Yes, and surely there will be webmasters who ignore the new product because of the fear of a decline in the position of their site in issuing results.