Has anybody done testing to determine if your combat ability bonuses (Pryo +5% fire damage / level), or ability bonuses (Int +5% damage, 2% magic armor) transfer to your summons at all?
If i'm building a pyro mage, I would hope that since I'm going heavy fire damage, my fire summon would also benefit from that, or that a hydro mage would get additional healing applied from their summons restoration spell.
Additionally if a summon does get bonuses from your Attributes, it opens up the door for summons to be useful for more than just mages. You could have a warrior with a summon that does lots of physical damage, or lots of extra damage to armor (if warfare level applied to summon).
Though I understand wanting to restrict to usage of summons, as you wouldn't want to make it something that is just always good to get.
