I think rich man- poor woman dynamic is so famous (although cliche now) because as u mentioned too it’s the status-quo. Although in the recent years there’s been a lot of efforts promoting feminism and equality between men and women but the traditional image is that the man is stronger/smarter and provides for the woman. I came across this question when I searched for Goblin on google
So that pretty much explains that it’s the traditional approach towards any love story claiming the man to be powerful and woman to be vulnerable. I’m not sure if rich man- poor woman tag is unpopular now coz I’ve been away from dramas for a while now but I’ve been seeing a lot more titles with modern story lines
Here are some of the dramas I know that don’t align with the above dynamic
Koi Desu: Yankee-kun to Hakujou Garu
The Beauty Inside (the drama)
It’s okay to not be okay
Barcelone: A love untold
My strange Hero
Suspicious partner
The romance of Tiger and Rose
The Tale of Nokdu
Youth Should be early