Surely Jim you are right. My was just a, possibly newbish, idea on how the ageless olm would be more competitive. Many people really like it for its flavour, but it surely is a difficult pretender to chose for agartha as it has only the most developed national paths and it is not an ultimate SC. But it wouldn't be really thematic to give it other magic paths than the ones it has (he is a salamander which comes from a subterranean cave - only earth and water come to mind for thigs he has always seen
)so no chance to increase national magic diversity, it has not many slots and it would be unthematic also to give him inbuilt one of the traits which are useful for SCs (I don't think it can be really fearful or awe inspiring, and surely he can't petrify or intangle)... So only making it a better mage in what it naturally has came to my mind. This possibly applies to other national pretenders which are good in flavour but the people maybe don't choose because they are -too- thematic.
But surely thanks for your points on balance. Maybe I was just too quick in giving my idea without thinking at the actual cost of a double bless.