Well, so tell me why those limitations in the traditions are? They seems to represent some set of beliefs, basic principles of what magic/mana is and how they represent it. If this is , as you say, a question of inteligence, why they cannot summon i.e. spirits of plants at all? Even in situations where that would be more Inteligent option then using anything else...IMO this is not just the question of dicepool, it also is a question of good roleplay...
If you dont get this idea, we will not understand each other further Im afraid...