The reason I think Tim Miller deserves credit? His film lost another $7 million off the top of its budget and had to cut some extra action scenes.
Something similar happened to Josh Trank, and his movie didn't turn out to well.
Just saying, Miller and yes the writers too had to turn lemons into lemonade after losing a chunk of the budget right before shooting. Fox clearly didn't have a ton of faith in their movie like they did. But they were able to see it through and work around losing all that money.
And just saying. A lot of people made excuses for Trank because he lost a significant amount of his budget for Fantastic Four before it went into production and some of the action scenes had to get cut.