
Yes there were. Older stories didn’t have much plot just romanticizing family relationship.
But nowadays I see a great plot with a sudo like incest relationship. Author cooking great plot with their degenerate preferences. I really want to enjoy the story through n through but it gives me sour aftertaste.

Well, it wasn’t really common like now. And I specifically pointed out "sudo like incest"... Back then only deranged publications were publishing incest stories. But now big publishers also start doing it and authors who can't directly add incest story, they used "sudo like incest" concept, so that there story doesn’t get censored.
And rare and common is not the same word. Back then only 1 out 10 stories you find that kind of plot but now it is 5 out of 10 or even more.

girl, you don’t even know what you’re talking about. you pulled that data straight out of the voices in your head. not only was it common, it was actually a super popular trope. one of the most well-known yaoi stories being incestuous — and even getting two or three anime seasons — is proof of that. (btw, that wasn’t even back in the 2000s, the last season aired in like 2016, i think). maybe you’re talking about covid times? i’m guessing you’re probably a teenager, so i guess that counts as “a long time ago” for you, lmao.
older bl was way more problematic, and this kind of story has been declining since the pandemic, one of the reading being because bl got more popular with western audiences, who aren’t as cool with those kinds of themes.

Well, I might not have been into this trope and always avoided it. That is why I didn’t know. And you are only talking about manga. Incest trope was most common in manga thn manhwa. Anyway, there is no reason for me to argue with you on measly things like this. I only put my "perspective" here.
Btw, I am in my mid 20s. It is pretty rude to guess someone's age out of nowhere.

We know this, though their point is that these type of stories had been decreasing overtime, but now they’re increasing again, and it’s concerning because it can alter the view of “bl” and why some people think people who read them are “disgusting” because most bls are twisted and abusive with sex and lust even now more within family members, which is SICKENING. No one should defend this.
Nowadays, why authors are obsessed with sudo like incest? Specially in BLs? It just ruin the plot most of the time. Great plot, great character, great psychological war then author decide "lets insert siblings, uncle-nephew, cousins romance. I mean why? Even if they are not blood related, it still feels icky.