That last part is important, because too much unnecessary information is as bad as not enough information. Again, ideally the system will be provided in the language of the user and keyed to how the work presents itself. I wouldn't recommend anything without evaluating the situation. Developing a full-blown EPSS can be very expensive and depending on the nature of the jobs, ineffective. In highly computerized, mature or maturing environments with many people doing the same or similar jobs, an EPSS can provide many benefits.
People can perform in almost any environment.
The bonus of an EPSS is the identification of opportunities that, due to lack of experience or knowledge, a performer without the system would miss. Learning is never unnecessary, but in good EPSS, the training can be focused on things that require learning to perform effectively. An EPSS can take many of the things learned today and support them as job aids, tools or embedded logic without taking up the capacity or time required for learning. Learning is required for skills that must be performed in the absence of support. For these situations, learning is required.