ms, doesn't your filling get runny? I don't like stiff either...when blueberry pie has
perfect slices, that is a sure sign that I won't like it. But I still like enough thickener so it holds a bit of shape.
Are your crisp/cobbler fruits high in pectin? That may be why they work so well for you without anything else. If the OR in your name is Oregon, I LOVED the blackberries there and can see how they might not need anything.