Signing Bobrovsky did end up being a great move, you can't argue that. Artemi Panarin's league 4th highest cap hit has not helped the rangers win a Cup. He routinely underperforms statistically and to the eye test. For the same reasons a Mitch Marner UFA signing would be terrible pending a miraculous turnaround where the team that signs him can rely on him to have elite production when the games matter most. No one cares about President's Trophies or winning your division.
Paying Marner $14+ million to come to Chicago and put up 90-100 points a year for a few seasons and then disappear in the playoffs is a terrible decision. Just a rumor I read on the Leafs board but the guy (and Matthews) is apparently hated by all of his teammates. He doesn't show up when it matters, blames everyone else, and commands the most egregious amount of money he can get at the expense of making his team better. Him boosting Bedard's production and making us a bubble team that gets stomped on helps no one.
We've drafted a very promising D core, we have a potential superstar forward in year 3 of his career, and of our offensive picks aside are going to start being evaluated at the NHL level soon. Not to mention we just traded for Knight. There's a lot to like here, Marner doesn't help us win championships.