No, sorry, you're very wrong here.
The relation between tags when applied to the question describes the content of the question. If I have Apt issues specifically on 14.04, I'm going to tag it: apt 14.04
The breadth of a tag has nothing to do with its use. When you apply it with other tags the scope of the question is limited. Consider tags as lozenges in a Venn diagram. By making them overlap you set boundaries and quickly tell people what the question is about.
I'm fairly certain this meta question is about a recent question of mine. It's represented here by the very centre of the Venn diagram in the three-way overlap.
And just by looking at the tags, somebody instantly knows it's about Apt and Bash in 14.04. Job done.
You're a very literal guy so before you dig through my questions and accuse me of blatent hypocrisy, I thought it worth pointing out that tags sometimes also need to be used additively when multiple disparate topics are covered.