It's way too early to create any implications. We didn't even agree on if it should be used at all, its name or definition. Both linked threads are about absurdly_long_hair with very_short_hair only mentioned as another idea and very briefly discussed.
Creating another hair length tag is a rather large change and requires proper discussion. I think it would be better to make separate thread about it.
This is to distinguish between shoulder length hair that's seen quite often and really long hair.
Shinjidude said: In general this is fine, though it'd be tough to apply retroactively. I'd make the change that very_short_hair apply to hair shorter than the jawline (to differentiate crew-cuts and pixie-cuts from short bobs). I'd also say that hair exactly at the shoulder-line is neither short nor long (as has been discussed previously, and as falls in-line with our policy with the non-existant medium_breasts tag.
I'd also avoid any further granularity than this, 3 levels is fine, 5 is workable, anything beyond that and it becomes a mess that is hard to keep consistent and well-defined.
Schrobby said: We could very well go with shoulder length hair as non tagged medium hair, but currently this style is usually tagged short_hair. Changing this would require quite a cleanup, that's why I suggested very_short_hair as a workaround.
Shinjidude said: We might be thinking of different things for "shoulder length". Most of short_hair is styles between roughly the chin and the shoulders (roughly Ayanami Rei to Hagiwara Yukiho to cite concrete examples), which is where I think it makes sense, shorter than that (above the chin or jawline) would seem to be visually distinct as very_short_hair to me.
Hair that is long enough to just graze the shoulders is long enough to be distinct from short_hair and doesn't seem to be a typical case for that tag, and too short to be long_hair. Takino Tomo (pre-haircut) would be a fair example of a hairstyle that doesn't seem to be either short or long.
The distinction between say Maya Ibuki and Akagi Ritsuko (post #473856) would be a good illustration of the cut between very_short_hair and short_hair I am thinking of. Maya's only comes down to her ears, wheras Ritsuko's goes down to her jawline or chin.