Not as much as a "gotcha" as it seems?
Straight up, Casablanca is pretty lame without Bogart.
Of course you'd get told to fuck off if you tried to sell a literal late 1930s/early 1940s screenplay in modern times without adapting it. Steven Soderbergh made The Good German with his clout after the Oceans movies which emulates 1940s film better than Mank and it lost millions, has been completely forgotten(even WB only uploaded the official trailer like 5 years ago in...240p) and the critical consensus was more or less
"Too much dialogue, not enough exposition, the story line was weak, and in general didn’t hold my interest."
(I actually really like it but I'm a Soderbergh fanboy.)
Plus script readers are mostly just supposed to be the first layer of weeding out the bullshit to avoid wasting more important people's time, right? Last week one of the Giant Bomb guys was saying that they interned for a production company and were tasked with reading scripts and making notes even though they had no credentials or qualifications and were just a 20-year old jerkoff.