[taotau]

Dyson swarms are fascinating concepts, but as we are learning about our own ever increasing energy requirements harvested from our ecosystem, moving around too much energy in a complex system can have undesirable consequences.

I would imagine that a planetary system as a whole has a 'climate' driven by it's host star, and redirecting large amounts of that energy would have unpredictable consequences. While most of the suns energy does leak off into interstellar space, before it reaches that point it interacts with various bodies big and small, solid and gaseous, it generates magnetic fields and powers phenomena we may not be aware of.

Perhaps the choice of creating a Dyson swarm IS the great filter, and any civilization that has achieved it finds itself in a state of 'solar climate crisis'.