I reckon "bunyip" got to the essence of this subject in his post re the "contamination" of the manufacturers systems and procedures by overzealous Flt OPs and the almost pathological need that most pilots have to demonstrate that "they know better than the other guy".
Who knows better how to fly the aircraft safely, than the manufacturer who built and certified it, you mess with that, at your peril.
FAR25.101 General.
(h) The procedures established under paragraphs (f) and (g) of this section
must--
(1) Be able to be consistently executed in service by crews of average skill;
(2) Use methods or devices that are safe and reliable; and
(3) Include allowance for any time delays, in the execution of the procedures, that may reasonably be expected in service. (my bold)
The recent QF1 was a classic example thereof and I would commend the the "QF1 overun" thread in Dunnunda as an interesting read.
Balancing ego and professional judgement is the trick.
The old joke about doing it "standing up in a hammock" because you can, seems to pervade the issue.
Boeing get right down to the guts of it, "keep it simple when it all turns to grief."