Thats what iv been suggesting.
Give thrash a cooldown like guardian.
Buff thrash’s damage equal to brutal strike or higher.
The cooldown will negate thrash replacing swipe/shred.
This wont cause any change in the rotation, but will finally give life to thrash. It will simultaneously buff AOe and ST. Most importantly, it solves the issue at its core. It doesn’t rely on borrowed power that will be replaced in 1 year.