If the suggestion on meta has been implemented, it will be good to see [completed] in the end of the subject, similar as it shown for [closed] questions.
It would be more explicit, than only "status-completed" tag.
It also will be visible in "Related" list on the right side of the page.
Clarification: I have not noticed the tag for particular request(probably, because I do not often use meta site). I read all discussion and voted that it is a good idea, and only later realised, that it is already implemented. This is a reason for my suggestion.
UPDATE: I see many people down-vote my suggestion. Please note that many users are not familiar enough with meta site and special tags in particular, so make the status more obvious will be useful for them.