Modern television isn't just The Big Bang Theory anymore. The line between cinema and television is quickly blurring, with television shows like Chernobyl that are essentially very long films. Even "regular television" can be incredibly enlightening, with shows like Planet Earth exposing us to parts of our own world we might never see otherwise and our imagination might not even do justice!
And much like cinema, sure the experience itself is somewhat isolating in that you're trying to pay attention to it and not converse with those around you. But what's beneficial about some television shows are the emotions they inspire, the conversation they generate after, the fantastical thoughts that come later while you process what you saw.
Sure, garbage exists on television in the same way that pulp fiction (i.e. low-quality literature) never really died out. But I don't think it's fair to dismiss the medium any more than it's fair to dismiss film or literature.