While the documentary shows Kramer in robust health and, later in life, as a frail senior citizen, it teaches viewers what can happen when one fiercely intelligent man (who is not willing to take "no" for an answer) speaks truth to power.
Movie adaptations, for book lovers at least, simultaneously bring feelings of excitement and fear. Will the movie stay true to the book? Will it project off of the screen as it did when the words entered the mind?
One of the advantages of fiction, however, is that it can leap ahead of the complicated, messy, process of technological innovation and speculate about the cultural consequences of change. That's very much the case with Lock In.