On the point of the Thorns perk becoming useless over time... As far as I can tell, the damage bonus from Might does not seem to affect the damage done by Thorns. Maybe it should?
Feel it would scale too well, if armour was keeping up with damage that should be enough Without knowing any future balancing plans, perhaps a late stage effect of might could be increasing the armour- which would in turn buff thorns - instead of the damage bonus applying