Simply put, most devs are #parricides. There's no longer an inch of originality in the summaries of the incest games now. They literally became caricatural.
Originality Starter Idea: MC finds out Mom used a sperm bank, sperm bank destroyed in mysterious explosion, is MC thus fatherless?, young MC haunted by angst filled questions of father's identity that can only be assuaged by banging and breeding his mom, marrys mom and studies hard to become great scientist, travels back in time to before his conception, jerks off into a sample tube that gets mom pregnant, returns to his own time and commits suicide, his sonther and momwife greive, and DAD IS DEAD!
Lesson, if you string together enough tired cliches you get "Originality" ala Hollywood! Just mail me the Oscar.