Websites that support mobile will be more likely to appear on the main page than those that do not support mobile. It's about the core of the notice.
In addition, a web that can be opened properly on various devices will certainly make visitors happy, because they will not find any more super small web page and must be zoomed several times to be read.
Designing an intuitive and good user experience is certainly not easy, because it is a complicated proposition. To help web designers gain balance and ease in keeping pace with web technology, Google introduced Resizer for web designers & developers to test their mobile websites.