It does because you can play a lot of heroes and they don't know who to ban. There's no guarantee but you have higher chance to win because you've got a large pool of heroes.
It's an advantage and whoever is playing it really can enjoy the game itself even if it's the most crucial part of the series, there's always a way for someone to enjoy the game and play confidently if he got those heroes of his.
Thats how should a game would be on which it isnt really just being too competitive or turns out to be pressuring you but rather you really enjoy on what you are doing or really likes to play and you could really see it on Team spirit and just like on what carlfebz2 said above is that having a large hero pool is something unpredictable and does signify that their main core player "Yatoro" do really enjoy on what hes been playing
because it is just quite tiring when you do just focus on single or couple of heroes and this is what i do also saw to be a huge advantage.
All of them have large pool of heroes and that's their strength and with what they've been doing, it's been effective to them. Their run was one of the best because during group stages, they're at the bottom and they're about to be eliminated but they did well on rising through the playoffs and won against with those strong teams including those teams that has TI champ winners including PSG.LGD who has TI champs too.