I just tagged uses for state machines with 'terrible-question' and voted to close it. This can't be good, but what else is there to do?
closed as not constructive by Rosinante, ChrisF, Martijn Pieters, hims056, Toon Krijthe Dec 6 '12 at 6:53
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Why did it need to be retagged at all?
I mean, the original tags weren't great, but surely just voting to close is sufficient. You didn't make anything better with your retagging and arguably made it worse by replacing half-way/kinda/sorta/if-you-squint usable tags with a meta tag.
The question itself seems kinda useful, too, even if not exactly stellar. I like the accepted answer, at any rate.
In general... it's incredibly rare for a question to not have any useful tags at all. When that happens, it's a safe bet that the question should be closed and deleted. In that case, there's not much point to retagging. Otherwise, there's gotta be something that could be come a relevant, useful tag even if one doesn't already exist on the site.