It's not about luck...But you cannot put your strategy on luck. There is NO WAY St.Louis thought Binnington could play like he did. And frankly, you wouldn't like it either.
If you have a goalie who you believe in, he doesn't have to have the reputation that Carey Price has.
It's not as important for every team to have the "best goalie on the planet".
I'm sure alot of teams are fine building a great team around a good goalie and banking on that.
That's not luck just a different strategy.