I don't think giving the difficult minutes to guys like Petry or Holl would be better for the Wings winning. Seider is their best defenseman, ergo he likely would perform the best in the tough minutes.
However, the fact that they have to use him like that is a massive indictment of Yzerman's GMing. Why did he acquire all these "veteran" defensemen if they're essentially unplayable in any kind of leverage role? Wasn't the point of those guys to make Seider's life easier, so that they can unlock more of his offensive game? Why is Yzerman wasting money on UFAs they can't even trust to play? Could they not have allocated that money better? Find someone to help Seider? A guy that can anchor a tough minutes pair, or a better partner for him?
It falls on Yzerman. He's been doing a poor job for years.