This is what sparked the idea that their magic required Arcane Connections
It occurred to me that he was right. The fact that Nature Lore RAW even at 0 allows a magus to sense important sites and major dangers in a whole area without the need for sensory magics breaks the Limit of Arcane Connections.
That's why I decided to include the Material Connection Virtue and have it be required. Since we are not using Nature Lore RAW, but as a magic theory, Material Connection takes the place of "connecting" to an area.
That means that if an exsules uses Material Connection on Lucien's Folly, he has an Arcane Connection to everything inside the area that is defined as Lucien's Folly. Therefore to affect anything inside Lucien's Folly covered by the Exsules Arts only requires spells to have a Range of Touch.
The same exsules cannot cast spells covered by Exsules Arts on things outside Lucien's Folly unless he has a separate Arcane Connection to it.
Now imagine that instead of Lucien's Folly, the area is the Ardennes. That's square miles of forest and the exsules has an Arcane Connection to anything in it.
If you believe it is still too restrictive, then I can remove the Arcane Connection requirement, but I would rather not add Spontaneous Magic since it's outside the bounds of Nature Lore RAW.