Actually, I wasn't even thinking of effects when I wrote that. There's a certain odd cadence in the dialogue in old films - a rhythm. It probably goes to stage acting. But while the writing was often fantastic in these great old movies, the acting just seems silly when viewed through the modern eye.
It doesnt have as much to do with theatrical style as it does the evolution of public psychology. The media-saturated generations dont understand how differently the worldwise communicate with each other to their even very recent ancestors.My favorite example is sarcasm. As a practitioner of the art for half a century, I can tell you that the world didnt begin to catch up to those for whom it came naturally until the mid to late 70s, when the cultural upheaval of the 60s & Watergate began to let people feel comfortable with not respecting/fearing our institutions enough to laugh at them. The deadpan assertions of the ridiculous which is a great part of social style these days was actually largely brought to America by having David Letterman in homes five days a week.Back to the original point, though - the ham-fisted movie dialogue of its early generations. It comes from the fact that people simply did not have inner monologues, by & large, til the movies and radio taught them how to. Behavioral styles were set in churches until the World Wars brought people from so many strata of society together under extraordinarily dramatic & immediate circumstances. At the same time, stories were first being told to mass audiences in media, so writers of same had to come up with both new expositional styles for the capacity for telling stories which occured over significant periods of time and express the reaction to same by the principals. It grew from the odd, declarative style of traditional theater into, largely thru the pathos & bathos of Yiddish theater & vaudeville, into stylized approximations of personality types. The number & variety of those expanded when naturalism and confessional methods of expressing oneself followed the aftershocks of WW2 and art & life have grown together in the decades since. The true beauty of language is how it grows and our communicative options have expanded almost as quickly as our technological ones. Speech, both personal & theatrical, has therefore become as different from that of 60-70 yrs ago as a microwave has from an wood cooking stove. I guess I'm lucky to have crossed enough of the history of mass media to be able to contextualize most of it, but i can assure you that you would sound no less ridiculous to a person in 1938 than they do to you. Failure to appreciate that robs one of so much depth in understanding of whence we sprang.Those interested in understanding it further should go back to the beginning. The wonderful critic Harold Bloom has written a book "Shakespeare: Invention of the Human" that showed how the Bard helped free people from the notion that all their instincts were part of the Voice of God by creating archetypes of personality into which to escape. wikkid say check it.