You dont know what your talking about. Ryze does not do 1600 to multiple targets in a teamfight. Quit making false claims.
2nd she does more raw dps than Ruze, her E is at a 1/2 second cd once she hits max cdr. In addition, she can kite much harder and has better anti mobility cc. Ryze has more upfront burst, but Cass is way better in a 1v2 1v3 than Ryze.
Like I said Ryze lacks sustain, which Cassiopeia has. Cassiopeia can still do AOE dmg, not as mich as Ryze, but lets stop pretending Ryze blows up whole teams with just EQ. Unless your team is dumb enough to be that close to each other, or you get wombo combod, Cass is a mich better teamfighter than Ryze.
She has more potential CC, she can perma slow multiple targets with Rylais Q, she has grounding (One of the STRONGEST not ultimates in the game), and more CC on her ultimate.
Cassiopeia beats Ryze in : Raw DPS (she is probalby top 3 in highest DPS) CC, Kiting, Teamfighting.
Ryze beats Cassiopeia in : Upfront burst, objective control (with ult)
I dont think I’ve had a problem with Ryze unless im playing Teemo or some immobile melee champion.