I looked to see if this was already suggested, or already implemented -- I felt I must be missing something. But if it's not been explicitly suggested, it seems like it would be easy, but quite helpful, eg. to have a discussion of a mechanic on a page explaining it, rather than on whichever card happens to use it first, or needing to make extra cards specifically for the discussion.

Hmm. Yes, this has definitely been suggested, but possibly long enough ago that this was only on the ToothyWiki page, not in the Feedback repository here. It is a very sensible suggestion, anyway; I just never got around to speccing it out because there were always shinier or more urgent things to fix.