In the USA our NFL football used to be fun when watching mud, rain, snow games. The players would slide and plumes of water would slosh up. It was always fun to watch them covered in mud. But that was in the 60's and 70's. Players sometime had ankle injuries, but rarely knew injuries. Then the went to AstroTurf, in the late 70's, 80's, and 90's. All of a sudden knee injuries became prevalent. Now most of the fields are grass with some sort of heating under the field in the colder areas. So big chunks of turf come up but not the mud games of the past. Not sure if these new fields have reduced injuries or not. But I have to agree that heating is not always the answer. The turf seems to be more of a mess then when it was natural with not heating.