I'm not presenting my opinion as the absolute truth, but I believe that such a "chance" isn't worth the time spent on the heroes. If we were talking about a game like Hearthstone, where a BO3 match takes about 30 minutes, then in Heroes, it takes a month, or even two! Due to the excessive time wasted, as well as the low chances of victory for any of the losers, I believe that the double-elimination system is not suitable for Heroes. This is just my opinion, of course.
Exactly, it's better when each round of the playoffs is played as a BO3.

