I remember when the it was questioned whether the Blackhawks were tough enough to beat the Kings in 2013.
And it was questioned whether the Blackhawks were tough enough to beat the Bruins in 2013.
And it was questioned whether the Blackhawks were tough enough to beat the Ducks in 2015.
In truth, no, they weren't tough enough to beat any of them. Fortunately for them, it was never an issue. Any time any one of those teams attempted to start some 'tough' ****, the Blackhawks simply laughed in their face, skated away, and scored more goals than them.
The Maple Leafs won't win any playoff series if they allow another tougher team to dictate how the series is played. If they dictate the series is played on their terms, in a speed, skill game, then it won't matter how tough they are or how tough their opponents are. They'll be too busy outscoring them.