I think you might be being a little oversensitive due to being in the industry and presumably working closely with writers. I'm obviously joking with the figure, and I suggested the other half made up for it anyway. If I got this upset every time someone said a mean jokey thing about lawyers or IT workers, I'd permanently be upset (and I bet you don't get upset when people say mean things about lawyers!).
My point is merely that there is a very great variance in how literate and film-aware writers in Hollywood seem to be, and it doesn't seem to correlate particularly closely to success as a screenwriter.
I think that this is a misunderstanding and I'm going to push back on this very hard. Here, let's take the most recent movie, because that's an easy one.
The Marvels has three credited screenwriters-
Nia DaCosta, Megan McDonnell, and Elissa Karasik.
The first writer is the director; while there are strict rules regarding writing credits, it's safe to assume that she received the credit for alterations to the script, not for the original screenplay.
Megan McDonnell graduated from Harvard (member of the Hasty Pudding Club) and has an MFA from USC.
Elissa Karasik graduated from Stanford and was known for having a prior #1 film on the the Black List (Frat Boy Genius).
Why do I put this in? Because the vast, vast, VAST majority of writers in Hollywood are actually incredibly smart and literary. You don't make it there unless you're really good. It's an unfortunate truism that the Business will ... well, affect scripts. That the writer's work is going to be hit by "notes," and by interference, and by changes. That's what happens.
But it's just bizarre to think that some of the most highly paid and competitive jobs in the world for writers ... don't attract good writers. In fact, it's a trope that we see over and over again in Hollywood. Ever see B
arton Fink?
Hollywood has amazing writers. They just don't always use them.