Why Beyoncé doesn't stand out as a particularly questionable inclusion or why I think the montage is generally entertainer heavy?
In the first respect, if you're going to go the route of including a lot of people from entertainment and sports, I would think her impact on the culture is at least as significant as most if not all of the other entertainers included. She also does have some extra significance for her interventions in debates about political and social issues through her artform.
In the second, I always felt the show itself presented this long struggle by a lot of actors to make the United States work as a society confronting issues such as equality, democracy, economic prosperity, etc. I then find the film at the end with all the images of celebrities like Marilyn Monroe, Elvis, Lucy, Michael Jackson, Madonna, Oprah, etc., along with a lot of sporting figures I generally don't know leaves you thinking that a very large percentage of remarkable Americans through history are celebrities first and foremost. Not a huge issue by any stretch and at least some of them should definitely be included, but I always left with that thought about the elevation of celebrities.