The branch is the whole question. In a fixed pipeline, step two follows step one because a line of your code says so, and the model does its work inside the node without choosing the next one [6][8]. Move path selection into the model and the executed route becomes a function of model output, which is where the nondeterminism in the dev.to account comes from and why the bugs stop reproducing [6][10].
The debugging shape changes with it. With five fixed steps, there are five places to look [12], but a failure at step 12 caused by a choice at step 4 turns into a decision to reconstruct rather than a step to rerun [11]. If five such decisions can fire in any order, the ordering space is five factorial, or 120, against the pipeline's one [14]. Independence and free ordering are generous assumptions, so treat 120 as an upper bound and not a measurement [14]. The direction is the useful part: irreproducible failures are the expected output of a system whose control flow is sampled at runtime; the tester did nothing wrong [10].
What the post does not carry is measurement. It gives no latency figure, no token count, no cost per run and no error rate [15]. Faster, cheaper, testable and debuggable is one engineer's account of one rewrite, on a workload that turned out never to have needed a chosen route at all [4][15]. For the conclusion to travel, two conditions have to hold. The flowchart has to be drawable before the run, which is the post's litmus and a question a team can usually settle in an afternoon [7]. And no step in the task can depend on discovering something unknowable at design time, which the post treats as the rare case where agency is load-bearing [9]. The second condition is the real gate. Where the next step genuinely depends on what the previous step found, fixed control flow cannot encode the task and the loop is doing work you would otherwise have to write [9]. Everywhere else, the loop charges you at runtime for a decision you already made at design time [6]. The log query that tells you which case you are in is cheaper than a week of arguing about what the word means [5].
