A Big Strength of Asian Teams is How They Handle Subs
In the West, substitute players are for emergencies, just a backup in case your star players get sick or something. Asian teams will often gather 2 equally skillful players for a certain role, but with different playstyles and champion pools. Take SKT at last year's Worlds. Faker and Easyhoon are both incredibly skillful players, but they both have wildly differing playstyles, Faker preferring fast paced brute force champs, while Easyhoon was famous for his control mages. Depending on the strength of the opponent, they could choose the better mid lamer for that matchup. Western teams will not be able to beat Eastern ones until they too adopt this style of substitutions.