Earlier quoted context omitted.
You seem to be suggesting that such a culture is not an impediment to success, based on the existence of some success. I could blindfold myself and throw darts at a board. The fact that I hit the board sometimes doesn't mean that the blindfold isn't an impediment. Many more movies fail before even reaching the screen. Just because we see some success doesn't mean that the culture isn't an impediment to success. Perha…
If you won competitive darts championships while blindfolded, that would suggest the blindfold wasn't an impediment. Given how long the movie industry has been around and how many studios have gone bankrupt through competition, I would think that any cultures that significantly impeded productivity would have been stamped out by now.
A movie studio is generally either very successful, or soon dead; there's not that much middle ground. So relatively small optimisations (such as not creating a hostile work environment that drives away employees) may not have much of an effect on survival.