On Drupal Answers, I sometimes ask for blocking tags that are very bad, or too broad to be useful. Considering there is also the possibility of burninating a tag (removing it from the history of the posts), I am not sure I know when I should ask for blocking a tag.
For example, on Drupal Answers, I removed the "developing" tag, which was added to 15 questions asked since September. I have already taken care of the tag in the past, and now it got used again.
I imagine that the first time the request should be to burninate the tag, and only when the tag keeps being used, ask for blocking it. If this is the case, when should a tag be asked to be blocked? How much questions should use the tag, after it is removed from the questions using it, for the tag to be considered for blocking?
It is also true there are tags that need to be blocked without being used from much questions, or even being first burninated, but I think those are really a minority. I am thinking of drupal, which would not make sense in a site like Drupal Answers, but it is still used on Stack Overflow, where knowing the question is about Drupal is necessary. (The tag is in fact blocked on Drupal Answers.
As side note, which information should be given when asking for blocking a tag? Should I say, for example, "This tag was used in the past in X questions; I have removed it, and now it was again used for Y questions in Z weeks."? Do community coordinators/developers see any information about the removed tags used from questions?