Claude Cowork and Grok Bot are good at letting a person hand off work. Linear Horizon is for when that work has to become a system other people can operate — with specialist products, inspectable state and gates where a person still decides.
The failure mode is subtle. A general agent can look like production because it completes tasks. It does not give you an account of what it retrieved, which tool it called, who was allowed to see the result, or where it should have stopped. Those are system properties, not chat properties.
If the job is personal leverage, a general agent may be enough. If the job is a service desk, a research workflow, a CRM, or a production control loop, you need products on an operating system — or a bespoke system designed around the estate you already run. Compare the models before you buy the wrong one.