Yes, exactly. I think the system of tags, warnings, and notes can allow for a surprising amount of flexibility for both fanwork creators and consumers. It's a pretty robust system, that way.

I also tend to think of Choose Not To Warn as a sort of caveat emptor, but knowing that there are people who put it on everything from fluff to extreme noncon means that I try not to make any assumptions about what might be in there, and I don't blame people for occasionally attempting a fic - especially if there are relatively non-threatening tags. I know how much I would hate to go to my friends to vet every single thing and if I could make an educated guess... *shrug* It's a complicated issue.