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Because they are usually ranked by search volume, which rewards chasing terms you will never rank for while ignoring the cluster sitting at eleven that would pay immediately.
An opportunity is a cluster where the gap between current and plausible performance is worth the work.
Ranking uses your own data: current position, impressions already earned, the click curve from your own pages, and the effort the fix implies.
A cluster at position eleven with two thousand monthly impressions moving to page one is worth a known amount, because your own pages at that position earn a known rate.
It will not promise a result. The value is a plausible range from your own history, presented as a range, because a point estimate would be a fiction.
Page records, clusters, the click curve from your history, and the backlog it feeds.
Only where you have no impression data. Your own is preferred.
Shown separately as content gaps rather than mixed in.
Yes, roughly by fix type, and refined as you complete items.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.