As far as I can tell, being a motorsport journalist and film director really only have one thing in common, and that is that fans would be amazed at what ends up on the cutting-room floor.
Interviewing drivers and team figures is one of the most enjoyable parts of the job. Most of the time, an interview is conducted with a specific purpose in mind - access at the top levels of the sport can be quite tightly controlled, particularly during race weekends, so time constraints usually demand that you stick to the subject or risk reaching the end of your slot before you've gotten everything you need.
The flip-side to this is that when you do have the chance to wander off the main subject, you can't always find a way to use the material that you get. As a result, plenty of interesting stuff never makes it any further than the journalist and their voice recorder, purely because it's not relevant to the angle of the story.