Supervision includes redirection, some intervention. More independence caused injuries or near accidents in the past. Can't make all changes. Some changes turn home into a nursing room or jail cell. The older the recipient, the less change possible without losing distinctive features of home.
Child plays outside with no adult supervision.
Your have a fenced-in yard. The child can't climb out. There are no hazards in the yard. Children always need to be supervised by an adult. Parents are not always physically within sight of children without mental disability.