Originally Posted by Your dudeness
In the end - IMHO - it boils down to personality of a pilot, a thing we canīt really measure (at least only to an extend) and we certainly wonīt be able to get a clear opinion of what it takes to be a good pilot and a safe operation
Instructing Newbees and CPL needs to evaluate if you may be soloing a Newbee despite you know he cannot be already a "good" pilot but that he is able to do a safe flight, and needs to build the personnality of the CPL to be able to resist to temptation to do absurd things.
In France an Airline Instructor does not need to have these basic instruction qualifications and he can sign a type rating on the base of SOPs. The checked pilot may ignore he is not able to analyse his own actions when the flight is no more standard.
Captain/FO : redundancy and generations continuity with experience transmission.