This recent question had too many tags, probably because there were pairs of tags (phrases/phrase-requests and idioms/idiom-requests) that were synonyms of each other, and the poster didn't know which one to use.
My view: absolutely not.
The phrases tag is not the same as phrase-requests — the first is for questions about phrases, the second for requesting phrases. Similarly for idioms and idiom-requests: they are related as they are both about idioms, but a request for an idiom is not the same as a question about one.
Prompted by this question, I've edited a couple of the tag info pages to make that distinction clearer.
If a question is wrongly tagged, the solution is to edit it [or suggest an edit, if you have less than the 2000 rep required for a direct edit].