An update on progress. I've seen three events for all thralls except Tissimo. At this point I'm convinced he only has two with photos, or if he has one more I won't get it in this play through. Maybe I haven't played enough times to unlock it, but I've had to do at least thirty playthroughs.
I feel like I remember a previous time that watching all the TV shows...did something. It changed the shows or the world or something. Didn't do anything this time. I also thought I remember achievements for beating all the guardians and seeing a TV show through, but didn't get anything this time. Overall, still really enjoy playing this game! Nothing else quite like it.