Shouldn't Karma's shield combined with mantra scale with her shield's lvl PLUS bonus dmg?

I mean,

Her Q does dmg based on the current level + bonus dmg from mantra Her W does dmg based on the current level + bonus dmg from mantra

Shouldn't her E also do dmg based on the shield's current level + a bonus dmg from mantra?

The old Karma once did that much with her shield : Shield and dmg : 80 / 120 / 160 / 200 / 240 / 280 (+ 80% AP) Now the bonus damage is : Magic damage: 60 / 140 / 220 / 300 (+ 60% AP) which is pretty much lower considering you must be level 16 to have the 300 (+60% AP)

Now we use Karma's shield to initiate a battle ... missing all the dmg (meaning that it's so low that we don't even care. We just want the effect)

If we could change the dmg based on her shield's level plus bonus dmg from mantra. Don't you think we would see more precise timing and more people use her shield during a combat?