The character of Tyler also got shortchanged. How long was he in that prison? Once he figures out he is two people in one body, he spends a lot of time screaming and brooding and there is no real discussion about the mental toll or PTSD that kind of revelation would entail. I forget the in-universe explanation of what happened to the original Tyler, but why not build a story around him and Voq in some internal struggle for control. And if Voq is controlling Tyler by this point and knows what's going on, why does he choose the moment he does, in the mirror universe, to break out and try and kill Michael. What is his plan afterwards, in a universe where Klingons are subjugated?