スラッシュ said: Those who claim it's not a taggable concept. If sister isn't a taggable concept, then neither is trap, genderswap, or alternate_outfit--or any other tag that is impossible to see without knowing canonical context (or Word of God). Clearly, we do take canon into account when tagging pictures, which makes little_sister a perfectly taggable concept.
But what does it convey, when it's merely an indication of familial relationship? Of course I allow and even support the concept of contextual tags, I just strongly defended them in a thread recently.
But only when they serve a purpose. genderswap and alternate_outfit are very visual concepts, their purpose is obvious. They indicate contrast, something different from what the majority of images of a character would usually depict. Trap is useful for blacklists, and indicating when something shouldn't be futanari, if nothing else. I'm not as big a supporter of that one as the other two though.
So what purpose does little_sister serve, outside of images that address the anime otaku concept of imouto/little sisters which is about the most I could ever see being in favor of? I really don't think it's a slippery slope argument to ask if you'd support tagging *every* relationship the same way. Of course it's possible to tag it but why in the world should we?
I just really want to know how you or anyone else is defining little_sister that wouldn't result in an equally strong argument being made to tag post #415353 as father, son, brother, older_brother, sister, little_sister, daughter and friend. Throw a mother in there somewhere and you'd need wife (or domestic_partner) and mother. That would be insane, even ignoring the paired versions of those I've seen advocated in the past (brother_and_sister, etc). Let's also not get into more complicated arrangements due to extended family or divorce or... I really hope you see my point, and that I'm not at all trying to be disingenuous.
Also, I've registered many times my objection to the spoiler potential in familial relationship tags. If they can't justify their existence some other way, like trap does (arguably... don't think I'm a huge fan of that tag however, I dislike the spoiler potential), that's enough for me to object to their use.
Not everything that "is taggable" should be tagged, as we both know, and so all tags need to justify their existence. I can't see where tagging these relationships comes in. And if we should limit to just one or two, what makes them special?
There are way too many problems with it.