Too often there are questions with one (or several) good answers, that have even been upvoted substantially, yet the OP hasn't deigned (for whatever reason) to accept any of them.
That little green tick really helps the audience weigh the value of the respective answer, and highlights whether the community is in obviously full agreement or if it's not a simple answer, regardless of votes.
How much against SE's guidance (and software capabilities) is the concept of a moderated and/or community-driven "answer acceptance" process?
i.e. answers with X amount of unaccepted answers, with a minimum of Y votes or whatever the algorithm, are punted into a Review queue to be "forcibly" accepted.
(yes, I realize this can apply to most if not all SE communities, but Writers is rather susceptible to subjective complexity which lends the green tick greater weight)