Thanks for this fine overview! Quite handy, especially the diagrams.
My 2 cents on this are however: What kind of program are you watching? News? Sports? Game shows? TV series? Movies? And: Was it recently produced or 30 years ago?
These questions determine for which screen size and resolution the program has been produced. TV used to be made for small screens, which means many close-ups and few large landscape-shots. Movies used to be made for the large screen, especially those in 70mm or Cinemascope - think of 1960s epics with majestically large landscapes. Mixing these 2 sizes used to be a bad idea: Movies on a TV lose much of their effect (especially with letterbox image on a 4:3 screen), and TV programs on a large screen make you seasick and negatively overwhelmed. When watching those older programs, say from before 2000, I would any day chose for the intended screen size.
Since then (give or take 10 years) things have changed: TVs diagonals have grown, HD and 16:9 are commonplace, and many TV programs (especially high-profile series) have adapted to this by putting more visual content into the image instead of the traditional close-ups. And many movies, in my view, have not only become faster and louder but also more in-your-face using more close-ups and an agitated visual language. To me, this means that I can watch TV on a larger screen (but rarely the size of a projection screen), and that I want a smaller screen size for some recent movies.
So, in practice, the choice of screen size is becoming more of a case-by-case decision. And this also has to do with the actual content, the story, the importance etc.: I rarely want to be overwhelmed by a simple news or late night show, even if it was made for cinema-size screens. Some movies, say romantic comedies, also don't need that for a fine movie watching experience. And some TV series are actually great movies with intelligent screenplays, photography and dynamic 5.1 sound.
That's why I keep my 30" TV next to my 130" 21:9 projection screen (yes, 4K will be great for that), and make deliberate choices on which to use when. By the way, this also keeps me from wasting my life time with bad, meaningless programs, no matter if it is TV or movies.