This inbuilt feature comes at no extra cost and is all you can ask for. Though there might be a little con to it among all the pros. At times this feature becomes so interesting that in order to have more and more info, the flow of watching the series or movie takes a backseat. And by the end of it one might feel the need to watch the whole thing again just to have that continuity and comprehensibility.
The millennial have an inquisitive mind and the quest to know more never dies. This eventually leads to spending more time on the platform either in reading the backstories or watching the series or film again and again just to make sure what you read matches with what you saw.
Anyways, that totally depends on the individual and his/her preferences and nowhere does it take away the credit that this feature deserves. In fact it’s something that more platforms can work upon because every binge-watcher loves that extra dose of infotainment.