Like it or not the CPL license sharpens up your skills and forces you to fly to tighter tolerances, it also provides excellent training for weather or passenger diverts
The FAA have got it right(er) here. Over there you also need a CPL to instruct, HOWEVER, you DON'T need a first class medical and, more importantly, you don't need to do something like 70% of the ATPL with all the time and cost associated. It's fine to hold instructors (or people doing sightseeing flights, etc) to a higher standard than PPL, but this has to be done within reason. As usual, in Europe it is not
