Yes, sometimes you just want to watch a specific show and you want to watch it now, and the streaming services are great for that.
But sometimes you just want to turn on the TV and watch something, anything, without really making a choice. I still have cable because it's included in the rent, and sometimes it's nice to just switch the channel to FXX or something and get maybe an old episode of the Simpsons, or a new episode, or maybe some Family guy, or maybe an old episode of some other comedy series, or maybe something completely new.
And that's nice and has value, but streaming services absolutely suck at that, because you always have to make a choice yourself with them.