Of course that also brings up another issue. By reading the comments section of this or any other doujin/manga before reading the doujin/manga itself you can potentially be exposed to more spoilers than the tags alone would have. Also in general all the tags do is say content X is in this doujin/manga it doesn't give context on where, how much, or why it occurs.
95% of the users don't bother to read the previous post, let alone the entire comments section.
That, and quite obviously you can choose to avoid reading the comments before the story, while it's not as easy avoiding reading the tags...
To make it clear, I'm on the "want the work tagged properly, no matter the spoiler" side. Because after got traumatized a few times by those white knights, I rather got spoiled than bad taste in my mouth. I check the comment first, if nothing bad happened, then I will enjoy the spoiled story. And by "bad" I mean something not my taste.
To @none.
You mean the post about "incest is the biggest twist in this story"?
Hell no, like, if this have incest tag on it at first, yeah we would know that there will be a sister x sister scene, but how will it happen? After dumps her girlfriend, the younger angry and rape kiss the older to show her how she felt. Or the older take the chance and comfort te broken heart sister.... many case could occurred.
But the biggest plot twist is that the younger is not innocence and have a weird fetish of cuckhold. The incest add very little surprise to it. Tbh, when I read it I was like "Oh, so she love her sister, ok"