After going through several threads, I haven't seen any mention that the loss of damage on the Mantra E makes it so that it is the only spell of Karma's that when mantraed gives no cooldown back through her passive. This is additionally important because Karma's Mantra E often had the best chance of maximizing the cooldown refund of her passive in a single hit because of it's large AOE damage. While I understand the shift toward CC over damage in her Mantraed W, it of course still interacts with her passive because of the regular W damage.
Is the passive increase at later levels meant to be a tradeoff for no longer being able to activate Karma's passive through her Mantraed E? Would it be possible to still have some damage, if only to activate Karma's passive?