Reasons that sitcoms stopped using the laugh track

 Identify 3 major reasons that sitcoms stopped using the laugh track. 
 For your first major reason, identify a direct example that led to the loss of the laugh track (For instance, you might mention a show, a network, a person, or an event that caused others to take notice) 
 For your second major reason, identify a direct example that led to the loss of the laugh track 
 For your third major reason, identify a direct example that led to the loss of the laugh track 
 What, now, is a new defining feature of the sitcom, according to the video, if not the laugh track?