You tag every single gallery you upload with the same set of tags and I'm genuinely curious how many people search for bbw or ssbbw but specifically exclude breast tags of any size. I think it's safe to assume that some of those tag combinations are one-way implied by the content of the gallery. There's a lot of tits and asses getting bigger in these galleries (breast/ass expansion), for example, but it's a result of weight gain to bbw/ssbbw. I feel like half the tags you've used across galleries in the past week and a half have that same level of being kinda useless. Who is going to use the tags for exclusion and search for a flat-ass, flat-chested bbw?
People who like flat-ass, flat-chested bbw... I've definitely seen art that fits that description. And much more common (which you didn't even mention) is the people who search for only content that has both bbw and gigantic breasts, which is the main reason the tags are there... Also it allows people who only look at at gigantic breasts tag to see all the gigantic breast galleries in one search. Why do more options bother you?
@Itachi-kun, more options don't "bother" anyone. It was a genuine question. Including every tag that can apply under the rainbow is valid if it doesn't violate the schema the site has laid out. It's just an oddity you don't usually see outside of specific circumstances, especially since some of the tags are low presence across most of the galleries uploaded, though the presence rule is hardly ever cared about it seems.