Any idiot can face a crisis - it's day to day living that wears you out.
It should be remembered that, at the time, movie cameras had only been recently freed from cumbersomeness by Monsieur Coutant. Suddenly movie technology could encompass spatial improvization.
It was of course our old friend serendipity. Music on film, previously, had always been a performance specifically for the camera, or within the physical limitations of a performance on stage, live or in a studio. But essentially rehearsed. The Sixties was the first time that Rock'n'Roll could just happen and be filmed. Where the presence of cameras was less interesting than the event, and thus cameras were more invisible - or deprioritized.
That, to me, is documentary film. That what is happening within the frame is more important than the fact that it is being filmed. Camera as pen. Hard to give rules about what is 'documentary' - but most people used to know it when they saw it.
Reality TV is not documentary. The presence of cameras is priority number one. The 4th wall is constantly acknowledged.
Documentary as a genre is as 'false' as Reality TV. In both, 'reality' is constructed in the editing room. I'm not saying one is better, just that they should not be confused. They both observe behaviours, but documentary has much more intellectual insight. imho. You can't be me, I'm taken