We've got a lot of tags which, in my opinion, do not make much sense. To give some examples:
- app-specific tags for "minor apps", e.g. tunein-radio (x1), repligo (x1). I fully go with tags for "major apps" which are widely used (good examples here include google-maps (x80) or google-play-store (x538). But the playstore holds over half a million apps -- we cannot provide a tag for each of them.
- question-specific tags applying to only one (or very few) very specific questions, as e.g. zipaligned (x1)
In my opinion, those tags are not very helpful -- but rather make tag-maintenance more difficult. So we might better...
- discourage users from creating such (sure, rep already does so -- but our better-rep'd members should be aware of this and not simply jump-in when a questioner mentions "...I unfortunately lack the rep to create this tag..."
- check whether we should "orphan" some of those tags, so the auto-purge cleans them up.
EDIT: MSO mentions some auto-cleaning task running monthly and cleaning up single-used tags from questions aged 6+ months, so this does part of the job. So let me refine my question to: What should we do when we just stumble-upon such an occurence where the question is, say, only 3+ months old, but the fact as such is clear?
Note also this quote from the linked MSO question:
Any tags not currently in use, or that happen to get orphaned through unusual means (rollback, merge, etc), are removed every 24 hours by a background process.
Another still remaining question is whether those two tasks apply to all stacks, as the answer just mentions 4 of them.