Shouldn't there be a re-tag option, for community questions?
Probably not.
Community wiki questions are editable by a lot more users than regular posts, and since you have 500+ reputation you have full editing privileges there.
Just as 2k+ users who get full editing privileges on all posts, you lose access to the retag option on questions you can edit completely, as it would be redundant: The edit option replaces the retag option for 2k+ reputation users. That's also the reason for the confused comments on your question: We 2k+ users don't have the retag link on any question.
With 20k+ rep, it looks like this (vote to close is a 3k rep privilege, protect is 15k rep):
If you only edit the tags using the edit option, it doesn't count as a full edit (e.g. towards the Editor badges).
You are in the unfortunate situation to have retag permissions, and, through suggested edits, have an edit link that places your changes in a queue. That's why there's both options:
- Retag is immediately applied, and only works for editing tags
- Edit is placed in a queue of suggested edits for approval by others, and can change an entire post.
Once you gain the edit privilege without prior approval, the retag link will disappear, as it's redundant.
