The system is designed to allow intentional tagging of questions, by the author.
I find that I often want to qualify an upvote or downvote in an answer.
For example, when I answer I'd like to point out how I'm answering for example, to say that I am an American English native speaker, or I claim special technical knowledge, or that my answer is speculative or from personal feeling as opposed to a systematic corpus search or quote from an off-line reference. And just like tags for questions, these things may already be mentioned -in- the answer textually as key words, but having a tag makes it easier to categorize and search. This could also make it more likely that an explanation for a downvote gets made (tags like 'I like this' (i.e. correctness may not be the primary reason for upvoting), or 'irrelevant' or 'coinage' or 'self-reporting' or 'AustE'.
This could be implemented just like tags for questions.
What would be the consequences of this?
What do you think?