One criteria i've seen for whether a tag is worth having is whether someone could be an expert in that topic. I find it difficult to believe someone could be an expert in all [published-adventures] but fairly easy to see people being experts in specific adventures. I myself have a ton of experience with Tales From the Yawning Portal and Tomb of Annihilation, but little to no experience with Hoard of the Dragon Queen, for instance. So while I'd be interested in answering questions about the campaigns I know well, I have no ability to answer questions about others.
So what I'm asking, is why do we use [published-adventures] instead of more specific tags for individual adventures?