Yeah, which why I said Yzerman's roster construction is bad and that he's a poor GM, and didn't make a criticism of Seider. Regarding your points:
1. Yes, the GM sucks. It's Yzerman's fault the team is bad and Seider is left to get buried.
2. It should be a goal. Seider has the tools to be a truly elite all-around defenseman, like a Heiskanen. IMO, that seems like it would be good for the Wings. Burying him with such brutal deployment, with no help, is not going to maximize him.
3. Even guys like Ghost don't provide "elite offense". Most players viewed this way are just PP merchants, but they don't create much build-up at 5v5 (EDM Tyson Barrie is the canonical example).