I don't think they don't care, I think they don't know how, or what to do, to play in these types of games. The way they normally play goes against what you have to do in games like this. They aren't consistent in close combat situations for full games.
If it is not that, then that means they are not willing to do what it takes, and I don't feel that is the case.
They were hardly alone, Bertuzzi was largely ineffective, Nylander was meh, Domi other than the one shot didn't do much.
That felt like every game 7 over the past 7 seasons tbh.