It's comforting to know that terrible adaptations of novels were happening long before Hollywood even existed. If Thomas Southerne were alive today, I imagine that's exactly where he'd be working, and the conversations he had with his assistant wouldn't be much different.
For example, here's how I imagine the planning process went when Southerne decided to adapt Aphra Behn's novel Oroonoko for the stage:
SOUTHERNE: Aphra, sweetheart, good news! I decided to make your novel super famous by rewriting it as a play! You're gonna have your name in lights, baby.
BEHN: Great! Although I'm kind already famous in my own right...
SOUTHERNE: Fantastic. Okay, so this story of yours - I love it. African prince loses his only love, gets sold into slavery, finds his wife again and is ready to be happy, but to save his wife and future child he decides to lead a rebellion, which ends in him sacrificing his wife and then dying a hero. Amazing stuff, the audience is gonna eat it up. I just want to make a few teeny changes.
BEHN: Okay...such as?
SOUTHERNE: Well, first, I don't think audiences are gonna be interested in just this story, you know? We gotta have subplots! So in the play there's gonna be these two sisters who are in Surinam to find husbands, right, except one of them is dressed as a man! You heard of Shakespeare?
BEHN: Yes.
SOUTHERNE: Well, he knocked em dead with the crossdressing and we're going to do the same. Anyway, so these two sisters are looking for husbands, and the one dressed as a man marries this rich widow and convinces her to give her all her gold, and then she'll reveal that she's a woman, and marry another guy. Also she marries her sister off to some guy she hates, because ladies need husbands, am I right?
BEHN: I'm sorry, what does this all have to do with Oroonoko?
SOUTHERNE: The sisters meet him once, and then they vouch for him when he gets manipulated into starting the rebellion -
BEHN: Wait, what?
SOUTHERNE: Yeah, we can't have Oroonoko decide to rebel on his own, that's too scary. He has to be convinced to do it by someone else. You saw Othello, right? I'm basically the new Shakespeare, here.
BEHN: Um...
SOUTHERNE: Also, the Imoinda chick - you say in the book that she's really hot, right, so obviously she's going to have to be white in the play.
BEHN: WHAT.
SOUTHERNE: Yeah, I'm changing it so Oroonoko's in love with a white chick who was raised in Africa. Blackface makeup is hella expensive, alright?
BEHN: I guess so.
SOUTHERNE: Also, the ending - grisly, sweetie, very grisly. He gets captured and rips out his guts in defiance? We're a long way from being able to pull off those special effects, honey. So instead, we're gonna have Oroonoko surrender -
BEHN: He surrenders?
SOUTHERNE: And in the end he kills the evil governer, and then himself. And then I'll toss in an epilogue about how his actions can be excused because he's a heathen, and that Christians shouldn't do shit like that.
BEHN: Okay, but what about all the stuff in the book about Oroonoko's past in Africa, and the parts that show what a brave and noble person he is? Where's all the white guilt over being his oppressors?
SOUTHERNE: No time! We have to make room for the cross-dressing sisters! They're going to take up at least half the play. Look, baby, I know what gets butts in the seats, and this is it. Leave it to me, Aphra. You're gonna be famous after this!
BEHN: Sigh. Just give me my check, Southerne.
SOUTHERNE: Also we're casting Megan Fox as Imoinda.
BEHN: *facepalm