I've wondered from time to time how difficult it would be to make Job into a stage play. It's all dialogue and would require minimal sets or costuming.
I'd say you're making a valid point in the way that you're saying it. I actually think it could make a good movie though focusing a lot of the back story we don't have much insight of. Christians writers doing Biblical fiction though do include lots of possible story lines.
Job's backstory must have been pretty interesting for we look to what he was,
There was a man in the land of Uz whose name was Job. And this man was blameless and upright, fearing God and shunning evil. 2He had seven sons and three daughters, 3and he owned 7,000 sheep, 3,000 camels, 500 yoke of oxen, 500 female donkeys, and a very large number of servants. Job was the greatest man of all the people of the East. Job 1
He would have been like a Warren Buffet of his day....or like the fictional Ben Cartwright of Bonanza owning the Ponderosa. With all he owned it would be like him being an owner in modern day as someone who owned not just one car dealership but many. Being called the greatest man in all the East is significant. How did he come into this place a movie could focus upon.
The movie could start at the end of Job's blessing where we read,
So the LORD blessed Job’s latter days more than his first. He owned 14,000 sheep, 6,000 camels, 1,000 yoke of oxen, and 1,000 female donkeys.
13And he also had seven sons and three daughters.
14He named his first daughter Jemimah, his second Keziah, and his third Keren-happuch. No women as beautiful as Job’s daughters could be found in all the land, and their father granted them an inheritance among their brothers.After this, Job lived 140 years and saw his children and their children to the fourth generation.
17And so Job died, old and full of years. Job 42: 16
Job could have one of his grandchildren on his knee and he starts telling him his tale of the early days. Then the film begins with a younger character playing Job. Many things could be said but I think such a film would have potential.