Quite simple beause her effective range is closer than Cass and needs to play closer to the frontline tank, which means she takes overall more dmg. She does have her icicle for range but a) its projectile with a delay and b) it has a lower rate of fire than Cass. Mei is quite ineffective if you play her far back.
When it comes to doing dmg shes a jack of all traits but master of none. She can do dmg at range, but gets beaten by actual ranged heroes. She can be effective up close but gets beaten by heroes which are actually close range heroes.
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