Certainly Leafs had high end skill but they were all at forwards. Other teams had and has high end skill as well.
TB has Kucherov and Point on forward and once even Stamkos replaced with Guentzel. Hedman on D and Vasilevsky in goal. Now they also have Hagel and Cirelli.
Colorado has MacK and once Rantanen and now Necas. Makar on D and Toews also.
Dallas Robertson and Rantanen. Wyatt Johnston also on forward. There's Heiskanen on D. Harley also and Oettinger in net.
Florida has Barkov, Reinhart, Tkachuk, Bennett, and now Marchand on forward. Jones and Forsling on D, Bobrovsky in net.
Vegas has Eichel and Stone on forward and now Marner. They also had Marchessault who played like a superstar. On D Theodore and Pietrangelo before he was injured.
Leafs have always been lacking in D, in net, in bottom 2 lines. It's always something while other teams with as much high end skill if not more have balance in all positions.
I suppose Edmonton is the the closest to how Leafs were built. They have McD and Draisaitl but they are 2 of the best in the world and truly difference makers.
No doubt about Montreal hence why they're back to back playoffs and improving. The core is tres young. I don't see them not making the players in the years to come. The only thing that can hold them back is injuries or goaltending.