Another issue here is one of 'customer expectation' - it's one thing using hour-building PPL holders (who are not FIs) to conduct introductory flights - this to primarily to keep the costs down, let's be honest - but if the customer's expectation is that they will at least get some basic instruction and hands-on experience during the flight (as per Ex 3) and they get neither, they'll be sorely disappointed! This has happened in my experience - it's important to establish exactly what the customer wants before the flight and resource it accordingly.
HW