There are perfectly valid reasons to want to have an image marked as the cover image (in the OPF metadata) WITHOUT having an html cover page (even one that contains the same image) marked as a cover page (in the OPF guide section) as a consequence.
Taking away someone's ability to do the one without the other (by automatically linking the two actions) would be presumptuous.
Quite simply put: cover page and cover image are not synonymous with each other. So 'marking' them should remain independent of each other.
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