Although I understand the imperative to be visual, it is not even remotely plausible that forest survivors lived in the open. They remained cramped INDOORS. Another jarring detail was the use of nails rather than using craft to fit logs together.
I am not guessing. I've translated a number of survival stories from Yiddish.
Leadership and risk taking was collective, rather than dependent on one strong family. The group was as safe as its weakest link. Survivors were not caricatures, but real and varied. They were not trying to make a theoretical point - they were trying to survive. And many did.
The film wants to be Shindler's List. Good though the film is, at that level, it fails.