I am not quite sure why

this bench in the park is not to be used. Perhaps because it was so popular, older people would sit on it in the sun gazing out over the view. Young parents would sit watching their children run around in the park. Busy people, not so busy people, lonely and popular people all used the bench, it was obviously just too good at it's allotted job.
The extra shows that other things in the park should not be used also.