Michael Keaton has demonstrated remarkable visualization in his debut as actor-director. While most actor-directors show competence, Michael Keaton created genuine visual artistry. Although one success does not establish excellence of talent, Keaton appears to have a promising future as a director. Knox Goes Away is on par with actor-director works by Clint Eastwood, Ben Affleck, Kenneth Branagh, Richard Attenborough, Greta Gerwig, etc....
The trend toward actor-producers has been quite beneficial to the quality of product in the industry -- to maintain artistic integrity rather than completely pandering to business profit. It also invites appearances by upper echelon performers, who otherwise would decline working on a particular project. Here, the example is Al Pachino. And the result is analogous to "form follows function."
