Well for the roleplay-aspect that fits well. It's actually the same way the "the dark eye" ruleset handles it, and I generally like it.
But right now in DOS..? Definately: No. Reason: Gameplay.
In the beginning summons are really useful, maybe even a bit too strong. In the end of cyseal (lvl 8-9) they feel adequate. But afterwards they start to seriously lack. (except some cases with elementals receiving "their" damage type) In most cases later the time to summon only prolongs combat with almost no benefit.
The only question is... are summons to weak or some other skills far too strong...
I also hope they revise the way physical damage is reduced.
2 effects (armor + resistance) affecting it as well as fewer skills to negate these it nets problems later on.
