The strategy-guide tag seems to mean a lot of different things to different people, from questions about strategy guides themselves, to questions that are the kind of information you would typically find in a strategy guide, to just general game strategy questions. Is this a useful tag that just needs a good tag wiki, or a confusing tag that just needs to be removed?
Related: [guide], [strategy], [tips], [how-to]... which do I use?, which covered a precursor tags guide and walkthrough. Which probably still exist.
If we retain it, I think its best utility towards existing as a tag is to indicate questions that want a strategy guide from outside. But unlike a full walkthrough, we are capable of and somewhat intended to be a strategy guide. We haven't gotten many of these questions for months, now, though, but that remains the main useful utility I can see for it.
Using it to describe questions about strategy or content in guides that we host on our site is redundant with asking it on the site. If you want to find guide-like information for a game on this site, this should be found by browsing the tag for that game, not browsing this kind of tag. That utility is also about the same as tagging it with "strategy", which we seem to agree needs to be destroyed. If something needs to be tagged like that, it should be tagged according to what kind of thing you're asking for - a weapons chart should have weapons, for example.
There are a lot of questions that use a lot of tags for the purposes described in the previous question. In addition to the two I named above, you'll also see questions with tags like tips. All of these instances tend to be low in quantity, so it may help for us to prune these down first, then re-examine what's left in order to determine what to do about walkthrough/guide/strategy-guide as tags.