Isn't Cassiopeia meant to be the anti-mobility mage with her new kit?

they actually talked about this during LCS. Jatt did I believe.

basically her W's grounded effect is a bonus. Cassiopeia was always a strong laner but was easily shut down by mobile champions who could just close the gap and ruin her day. the W now makes Cassiopeia a character who now is strong in general and if the champion has mobility she now has a WAY of dealing with that. it doesn't make her instantly beat the mobile champs. she's not an anti mobility mage. she just has a way to deal with it herself. it gives her a unique tool to play around and makes her interactions super interesting.

Cassiopeia is awesomely designed right now, its just her numbers are grossly overtuned.

she basically is same ole cass with E spam machine gun and ridiculous DPS but she got new tools. a better W, and a Q that does more dmg.

they took away none of her strengths and just gave her new ones. her new passive is a little bit of power gone, but her late late late game is still good since she doesn't have to build boots.

I think they need to reduce some of her E damage or maybe lower its healing a bit. her sustain in lane is kind of oppressive and her E damage is as strong as before. they need to nerf her in some way to compensate for her cool new kit.

her kit isn't the issue. she is just imbalanced right now, numbers wise.

because if she is anti mobility... doesn't it make sense then that she would be effective against champs who aren't very mobile?

Because lol mage mains bitch about everything.

She doesn't counter mobility well...

She is still more functional against immobile targets that can't outrun her bonus MS from her Q while can't instantly kill her before getting ripped apart by her E.

Because she's a kite mage. And she's ruining top lane.

because her abilities are telegraphed. also she is more of a sustained damage than bursty. shes not as bursty as even azir is

Because mobile champions can completely ignore her W by avoiding it entirely

Her W utterly fails at being an anti-mobility move. It's too slow to actually stop mobility reactivity and the AOE is equally disruptive to everyone, it's not like immobile champs can ever risk walking into it anyway.

If you want an actual anti-mobility champ they need a ground which functions effectively like Rune Prison.

Is it Rylai's?

Because a good cassiopeia shits on everyone not just immobile champs.

Probably because her W also has a slow tacked on and is position based. Combined with her bursting you with my dps dps the only way to play around it is mobility or longer range