I'd say it does depend on the newb's character and how much they have experienced in those previous 5 days. Are they tough, strong, rugged, outdoor experienced types? Or are they fragile, weak, and naive to survival types? Did they experience some battering swims through rapids in the prior 5 days that they may have gained respect and understanding from? And did they receive critique and teaching from their mentors about how to have done anything differently? Etc.
I agree that jumping into Pine and #s with only 5 days experience may be rushed for most people. There are some places in each that, especially at low water, it would not be a kind experience to be upside down in or out of your boat. Much of the time, though, it might not be too bad of experiences. Again, that being for the mentally tough type of individual. However, the mentors better know that they may suddenly be dealing with a threatening and scary ordeal for the newb and themselves. So, know your crew. Do you want to go there? Are the mentors being thoughtful and respecting of the newb's potential for survival and continued interst for the sport? Mentors should contemplate and be considerate of this. If you've never experienced a catastrophe, it is no fun and can be tragic. Be respectful and careful.
Kayaking is a fun sport and, even though it is filled with varying levels of scary experiences, most of the time it is a safe sport. Most of the time.
Personally, I have done several decades of very difficult dirt biking in the mountains and of kayaking. I've learned that you are much more likely to have excruciating injuries dirt biking (a sport where you can breath air and basically control the throttle, i.e. - action), but more likely to die kayaking (rare, but probably more likely than serious injuries).
Knowledge is power. Be respectful and considerate. That said, we should experience YHWH's creation and rejoice. We get to enjoy it ... to the fullest if we choose. Kayaking has been one of the greatest influences on my own life, and I owe it to my mentors that taught me well and encouraged me.
No risk, no reward. It is not that we have to, it is that we get to. Preparation and education are essential to self-confidence and success. - KV
"If there is no risk there is no adventure."- Bill Briggs