whether or not that trajectory is PANS-OPS compliant, approved or published.
I know that I'm getting sucked into the aspect of the thread that I was trying to avoid BUT........
The point I was trying to make about approved vs home built approaches (and, to an extent as well, cloud break procedures) is that you get a much better indication that you are deviating from what you KNOW to be a safe profile on an approved IAP than on what you THINK is a safe profile on a home built approach.
There has been a thread about this running on PPL/IR which has divided opinion as well.
My own view is that, purely from a flyability standpoint, there is a world of difference between descending over the sea and then following a home built approach that you have programmed and stored into your NAV system and flown several times in VMC to test it to an airport with no hazardous terrain vs making up a descent and approach into a mountain airport when you get stuck in unexpected IMC.
Obviously, those examples represent the extreme ends of a spectrum of danger, and everyone has to decide where their comfort level lies.