I work at Speakeasy where we do a similar thing with the AI control plane (https://www.speakeasy.com/product/ai-control-plane), and we just rolled out on-device agents for the same reason.
I think the point a few people are making is right that its not sufficient to be the best at one layer like the device endpoint. AI governance needs to be coordinated over a number of surfaces. We started with an MCP gateway and drilled down to on-device agents. I imagine you might end up doing the same the other way around.