Also, it enables you to use one less device, which means one less connecting wire, and one less thing cluttering up your home.
I personally don't want a "smart" TV because they can spy on you:
http://forums.audioholics.com/forums/televisions-displays/87736-lg-smart-tv-spying-you.html
Notice, it even sent information regarding things NOT viewed online. Obviously, everything you do online can be watched by others, but this example went further than that. If I ever buy a "smart" TV, I do not plan on giving it my internet password and keep it offline.
There are many examples of things being included that are not always helpful. For example, most of us who use HDMI connections have no use for every device having its own digital to analog converters. I would rather not pay for them in everything, as it is a waste. However, some people do want to use them, and so such things have often been included. They make the devices for selling large quantities, not to please you or me specifically.