The "loop vs graph" debate is one I have been following, and the conclusion that loop engineering is just the simple case of graph engineering is the right framing. I have built both, and the added complexity of a full graph only pays off when you have complex branching logic or human-in-the-loop checkpoints. For most agentic workflows, a well-structured loop with clear exit conditions is enough. When do you decide to move from a loop to a graph-based architecture?