Living room is an important part of every home, alive and of many different persons. This special place will be the abode where people spend their spare time whenever they want to talk or to socialize or relax. It usually includes a cabinet or a divider but sometimes it is used as a useful space especially if it has a kitchen.
The main reason for that is related to steel and glass furniture. Such a divider can be very practical in open spaces and provide the privacy you need. In an open living room it would be useful to have some sort of counter or storage where you can keep all your things and alone, the rest of the time just sitting down.
The living room on the other hand is a display area that might look something like a dining room. In that case, you could have a fireplace, maybe a framed painting or your old chandelier and some plants. The divider could be just an extension or a decoration. For example, you could have a sort of divider between the living room and the bedroom that is not just for show.
Picture sources: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 and 16.