I hope people don't get too caught up in how "the movie never transcends it's stage play roots"
And the truth is, it's not supposed to. The film is trying to repackage an amazing play for the masses. It's not about transcending anything.
Nah, film and stage are different mediums. Simply repackaging the art doesn't work. Denzel tried to do more with it, to make it more cinematic, I just don't think most of those choices worked.