Are some tags more important than others? Is there something like a "primary tag" that identifies the largest-scope problem domain which always appears first?
For example, in this question, the matlab tag only appears second, even though the fact that this question pertains to Matlab is far more important than anything else.
Basically, every tag that identifies the programming language should be listed first. More generally, there could be a hierarchy of tags (a DAG, I suppose, if tags can have multiple meanings) determined by how quickly one is able to discard a question as not interesting, and tags should be presented in that order.
Is there any such feature already in SO? If not, would it be desirable?