In the case that the epistemic helper can explain us enough for us to come up with solutions ourselves, the info helper is as useful by itself.
However, sometimes even if we get educated about a domain or problem, we may not be creative enough to propose good solutions ourselves. In such cases we would need an agent to propose options to us. It would be good if an agent that gets trained to come up with solutions that we approve of is not the same agent that explains to us why we should or should not approve of a solution (because if it were, it would have an incentive to convince us).
In the case that the epistemic helper can explain us enough for us to come up with solutions ourselves, the info helper is as useful by itself.
However, sometimes even if we get educated about a domain or problem, we may not be creative enough to propose good solutions ourselves. In such cases we would need an agent to propose options to us. It would be good if an agent that gets trained to come up with solutions that we approve of is not the same agent that explains to us why we should or should not approve of a solution (because if it were, it would have an incentive to convince us).