I can assure you there is very little possibility you will find a PPV video on youtube that I have not seen. Though if you post them I will look at them. Please take the time to review each example and determine if the situation fits the proscribed "done properly" that I put in my challenge. I understand completely what can happen when PPV is done either improperly from a functional side (too small an exit opening) or improperly from a procedural side (firefighters committed to the space) which is why I preface the discussion with the done properly.
Let me see if I can answer the points in you post.
1. A fire on the third flor would be a challenge for a PPA attack. There are several methods that would work and while they would be delayed I could make the case that the handline placement to the third floor would also be delayed. I'm not saying PPV/A would work every time. Nothing works every time. I could easily turn this question around though and ask what your ventilation plan would be for the same: Fire on the third floor of a 4 story building?
2. The idea of no victim in the exit point is - No victim IN the exit point. In other words they are not visible in an opening that could become an exit point for PPV/A. My feeling is that this is also a contra-indication to a direct attack for a fire in that area without first rescuing the victim. What would be your normal procedure for a victim IN a window that is likely to be part of the fire attack ventilation plan?
3. I am surprised that anyone teaching PPV/A said that all the doors had to be closed in the building to make PPV/A work. This is not the most up to date information on the tactic. The biggest problem with PPV/A relative to the exhaust is not having ENOUGH exhaust points rather than having too few. I have used the technique successfully plenty of times in SFD that had all the internal doors open.
I won't try to sell you on PPV/A. Just be aware that the tactic is used successfully by many departments across the country. If you look on youtube you will also see plenty of videos that show poor outcomes with horizontal ventilation and a few with vertical ventilation. I am advocating well-trained firefighters using the proper method at the proper time. There is a friend of mine in my department with whom I have this discussion regularly. Thanks for staying engaged.