Bergeron was also nowhere near the top in the league at that time. Matthews is near the top of the league.
Like if you are upset about the term because you are convinced Matthews is going to hop on a plane to Arizona at his earliest convenience, then that is fine. Tavares did it, but he was the only one (and I think TOR has a lot more to offer Matthews than NYI did with Tavares). I'm going to trust on the side of dozens of other guys who did not do that, and that Dubas, who has had direct contact with Matthews and his agent enough to gauge whether Matthews has a longer term future in Toronto beyond this deal, was able to make the right call.
If he ends up being wrong and totally misplayed it, then we can criticize him in 5 years when Matthews walks for nothing. Right now though, let's give it a rest. Maybe people don't agree with the type of deal and we should have just paid more for a longer term, but in terms of value, it's not any worse than if he took an equivalently fair 8 year offer... And it's not like Dubas blazed any new trails for deals anymore than all of those other GM's in the past did with their own RFA's.