First off, you know little of the reasons why Rynn decomposes people. I've personally witnesses her decompose people that haven't touched her in any way, and on countless occasions repeatedly decompose the same people for purposes of vengeance.
The intent of the animist or druid skills are to bring peace, not get revenge. And I'm sure the whole initiation of the decompose skill was because the animists had no effective way to fight back aggressors.
Secondly, you claim move quicker, keep up defenses? That is pure folly, there is NO defence to decompose other than not being in a forest location. And if you think it should be common practice for rogue animists to hold a portion of the population at bay and out of the forest, you're sorely mistaken.
The fact that an animist or druid can flow directly to you and decompose in one fell swoop, negates any claim of defense. The reason their are complaints against Rynn across the board and across pretty much all cities other than SD is because she's using the skill in an aggressive manner.
Clearly you are fond of her, I'd ask you to look past that bias and the actual situation. There is no singular skill that wields that power in mortal's grasp, and there's a reason for that, because it was intended to be a last ditch defense from attackers
Written by my hand on the 23rd of Paglost, in the year 1216.