This is a dramatisation of the real-life events covered in Citizenfour
. It provides very good background and simplifies things well for the idiot majority. The difference between the two films is like the difference between shagging a real woman and shagging a sex doll. The sex doll may be better looking but they just don't have the genuine squeals of pain - nor do they omit the same odour - which, for me, are the things that really makes the experience truly worthwhile.