Argon2 is built on top of BLAKE2 but the hash function isn't what's making it so effective, it's memory hardness, i.e. it fills the RAM when deriving a key from

Argon2 is built on top of BLAKE2 but the hash function isn't what's making it so effective, it's memory hardness, i.e. it fills the RAM when deriving a key from password, which makes massively parallel attacks impractical because GPUs / ASICs don't have petabytes of RAM just lying around.