Counterpoint: we have 2 versions of the SuperDuper backend... one is deterministic flow control w/ small agent contexts. The other is Opus a modern harness big ass system prompt permission to go ham.
The former is infinity better for cost optimization. And easier to reason about. And to eval. It makes for a great customer experience.
But the Opus agent? Buckle up. We see truly emergent behavior every single day. Like batshit crazy cross-correlations, decision making, deductive reasoning, and inference. Nothing we mere mortals could have ever prescribed with a deterministic workflow.
It took the product from "great customer experience" to "How in the Cinnamon Toast Fuck did it do that???" (which, to be clear, is my north star)
dont use prompts for control flow if you can use control flow for control flow!