Not to mention, really hard tires would have very poor grip. The rubber needs to be a bit softer to squish around all of the little imperfections in the road, technically increasing the contact area and providing a little lateral bracing (probably not the right term so I hope I’m making sense). This is why a lot of performance tires have shorter lifespans then other tire types, because in addition to a different tread pattern, they also often use a softer, “stickier” rubber, which wears out faster.