To replace SaaS, you need the unglamorous stuff: declarative deploys, audit trails, version history, identity, and a memory layer that survives the inevitable agent failures. Those are the primitives that make in-housing tractable.
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Basically you need dim - reliability -- high and dim - observability -- high
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This was what made Gas Town difficult to explain to non-technical people. It really is like the Kubernetes of agents, but if you don't understand the value prop of Kubernetes, you won't get the value of Gas Town. It's not that it's a factory that makes your software, it's that it's a reliable and observable platform for the factory that makes your software.