The stated goal was to make the Destines generic and applicable to multiple classes. If this is the case why limit the stats that you can increase in a Destiny Why wouldn't a casting FVS want Magister? It should allow you to raise Wisdom rather than Int or Charisma. We have been told Fury of the Wild is a Ranger destine. Why only Strength and Constitution? Why not Dexterity? If you truly want to make these destines open to any class do not limit the stat that can be raise by a Destiny.
Allow the selection of any statistic but lock it to that statistic once the first one is chosen.