Overview
The advantage of this tag is that, unlike many other evaluation tags, which are largely based on the subjectivity of the tag editor, it is possible to search for works that are highly rated within pixiv based on a clear criterion: the number of bookmarks.
Of course, the increase in the number of bookmarks depends greatly on the contributors, the popularity of the genre itself, and the popularity of the characters, so it cannot be simply concluded that works with fewer bookmarks are inferior.
Unlike subjective evaluation tags such as futsukushii or 10 points are not enough, which are created by the viewer, this tag has value as a search tag because it is an objective indicator for which criteria exist.
Incidentally, because of this feature of objectivity, it is an exception among evaluation tags in that it is not called a "self-tag" even if the contributor adds it by themself.