Why I cant comment on Asha'rah motives for the whole thing...I can sorta see the general point.
I think the issue is that Hakai, no matter what you consider it to be, is a part of the system. Gods of Destruction are a thing, and there primary job is to use Hakai to destroy things.
Time manipulation is breaking a system to make it work for you....and in breaking it you can cause more unintented(or intended) damage then just someone running around hakai..ing planets.
To me...it seems Asha'rah is stuck in a position where she both promotes growth as a goddess of creation, but believes that certain parts of the system shouldn't be messed with. So where can she draw the line between letting things grow but preventing them from growing so much they break important systems like this.