Three reasons:
1. Picking something to watch takes time. Sometimes I only want to see something in the 15 minutes that I'm dining alone. My meal gets cold before I start the video
2. Choosing something to watch is stressful. If I'm tired and I don't know what I want to see makes me more tired and frustrated. These are the times that I don't want the freedom to watch I want because they are the times that I don't want to think about what I want
3. The random factor of watching something that I would never watch by myself it's something that makes me go outside my bubble. I can't say how many good movies (or songs, etc) I found by that randomness
I'm not against the freedom of streaming services but there are moments that I just don't want that freedom. So, thank you!
Or to make another analogy, if you go out and sit at a bench, who knows what will pass by?