I really hope Polymorpher skills aren't INT based, this would be a pretty serious oversight in my opinion. Or at least in the skill tree have some that are INT based and others that use different base stats. It should at least be viable for non-INT based classes
Apparently, it would be "too confusing" having different polymorpher skills based on different attributes, and people would dislike having to invest into different attributes for different skills in the same school.
It's a bit disappointing, but I can understand the logic.