Quality and usefulness High quality and usefulness imply: not a duplication of other proposals, contains a definition + a comparison to existing or other proposed tags (like “a=b is better than b=a because …”, “you can not express … with the tags a, b, and c”)
I am talking about the conjunction of different factors here, for instance if we have a poor proposal which seems to be incomplete, and it was never voted upon, then its age is an additional factor for arguing in favour of deletion, because the chance that the original author comes back are pretty low.
minor edits, spell check…
I the problem are lists, updated by humans comparably to “manual categories” and poorly related “see also” links.