As someone who both approved quite a few of the edits which the question refers to, as well as someone who frequents the active questions feed, I am in two minds. All the tag edits which I've seen have been helpful and accurate, and therefore I have approved them from the review queue, however this does have the annoying effect of filling up the active feed. This is exacerbated by the fact that it will often get filled up by many questions all at the same time due to someone going through the review queue.
I feel that a gentle reminder that edits should try to fix all issues with the post, and not just be used for adding tags, should suffice for now. I don't think we should reject these edits as too minor because accurate tags are very helpful for finding questions relevant to an area of interest. We will have to get used to the fact that as the site grows, the active feed will become less manageable - I defy anyone to read every update on the unfiltered SO active feed, for instance. We can still use the new questions feed to ensure that new contributions aren't missed.