There are considerations that arise when commanders deploy those resources. Bombers are hideously expensive to operate, and this particular version started out life as being hideously expensive to acquire. That combination will give pause to mission planners about risking such hardware in the first place, unless the target is of high value. That’s why they’re not deploying the F-22 (Another vindication of Eisenhower’s admonition…) during these banana wars in the Middle East. The planes will only be used when planners KNOW they’ll be flown on milk runs.