Probably would have been even more powerful if they did that with Alexander.
I think the problem is a lot of fans might have been tired of the tragedy for Worf arc that kept occurring.
It was as if they threw Kurn's life away to write it in the story.
Kurn was an interesting character, so it seemed like the way he exited the series was...awkward.
It would have been cool to have seen him later on his new life and identity.