Nerf Janna's shield, and revert 4.1 buff and 6.6 nerf on her ult?

During Patch 4.1, she got a major buff on her ult (See below). I think that over time she got her utility (which is the low skill expression part of her kit) buffed with all the items enchanters got. If Riot wants to give her to be more skill expressive, her healing and shielding ability needs to be nerfed but gives her more tools on crowd control and disengage.

Patch 4.1: REMOVED: 0.25 seconds delay before channel started. Total duration reduced to 3 seconds from 4. Base heal increased to 100 / 150 / 200 per second from 70 / 110 / 150. Heal AP scaling increased to 60% AP per second from 35% AP. Total heal increased to 300 / 450 / 600 180% AP) from 280 / 440 / 600 140% AP

She received this change because of her bad enchanters was without any access to items. Now enchanters got items that increase healing and shielding power, a revert on this buff make sense since she would still be stronger compared to what she was in previous seasons.

What could be brought back to her kit?

Patch 6.6 Monsoon Knockback's stun duration reduced to 0.5 seconds from 0.75.

If she has 4 sec channel time on her ult, i think it is fair for her to have her knockback duration back. It focuses more on her crowd control/ disenage ability instead of healing and shielding that has lower skill floor.