LLander.
Firstly you're very polite, in general your posts are always very polite just wished to make a mention of that.
I do see what you're saying with regards to putting your nose into it, I for one can say as I've been on the other side I do know what goes on and actually its quite refreshing when the "front" take an interest in the cabin.
I do my level headed best to help the crew as much as I can because I know what they have to deal with.
I think that there should be more emphasis on 'across the line' comms of crew/flight crew.
Sorry I'm a bit confused as to what you mean by the "are Gen Y" meaning female gender?
I do get the fact that some will take a mile if you let them but the verbal support from the front helps massively in the back when dealing with anything and I don't think its right for a PUR to undermine the PIC as at the end of the day - his name is on all the docs as you said and its his responsibility.
Unfortunately the clueless PUR make the job just that much harder.