Cool Cass changes, but they didn't fix her main problem
That being that there's no place in the game for a sustained poke mage, when most other champions are killing their targets in ~3 seconds. Cass is either dead or the fight is over before she's had enough time to do her thing. On top of not having compensation for the mana nerfs and loss of her passive, while she was already in a pretty bad place prior to these changes.
Please do something that makes sense for once and fix Cass to work with the current state of the game. It may feel 'less poisony,' but her Twin Fangs spamming play style was more viable than what we have now.