The model is not the system
The instinctive picture of an AI system is a single model producing answers. Input goes in, output comes out, and the only interesting question is how good the model is. That picture is becoming a poor description of how serious AI work is now being done. What is actually being built, in the systems that get pointed at when people talk about reasoning, is closer to a small bureaucracy, though often an ad hoc one assembled per query rather than a fixed organisation. ...