Wikimedia-wide WikiProjects (narrow focus)

Detail. Each global project can sort that out for itself. But it is worth noting in the outline that local norms such as strictness, fair use etc may vary and not to assume they are (or should be) the same.

Likewise "You may wish to transclude the portal page to maximize reach" would be worth recommending, but I wouldn't advocate transcluding it all; there could be many many pages on a significant wikiproject.