I'm not sure I understand the question. There are no rules like that in tyFlow.
Maybe you're thinking about how you should disable hole capping if you fracture a flat plane with the Voronoi operator? That's not a rule, just a guideline since otherwise the algorithm will create coincident faces.
Maybe you're thinking about how you should disable hole capping if you fracture a flat plane with the Voronoi operator? That's not a rule, just a guideline since otherwise the algorithm will create coincident faces.