Of course, it is not the mat that needs an element. You as an individual practitioner are the beneficiary of this or any other mat. But why does a mat make a difference when it is you who is practicing? There are ways to come to this conclusion. Some just feel it. And surely you have had such an experience before: standing barefoot on the ground. It is such a common practice that there is a verb for it in almost every language: grounding. It literally means to come into physical contact with the earth.