The majority usage of scope at this point in time is to indicate which topics should be allowed on this main site, in line with its description:
The scope of the main site: what questions are on-topic and what is
In line with this description I just removed the scope tag from three questions which talk about question scope instead. I do not feel this would make a question on-topic or off-topic.
To come back to 'question expertise', which could also be considered scope, a recent review of Meta shows this is a major topic in its own right.
It would be worthwhile reconsidering my earlier proposal of bunching them all together in one tag. The scope tag could still remain, but we could create more specific topics and expertise tags perhaps?