I'm still trying to progress the dev's feedback vs the changes: 'we decided to focus on kanna's damage rather than the party support ability' but in reality, the trade of final damage to boss damage is SEVERE if you're not a kanna mule (especially when you consider how final damage scales).
The result of these changes is just nerfing both support and damage of kannas. If your wish was to get the weak kanna mains kicked out of parties due to lack of damage nor a buffing support, You're on the right track.