Centaurus....I get your point but I don't think it is that 'cut and dried'. I think that the safest operation would exist somewhere in between your ethos and that of Rananims'.
Thats the tricky bit, if it was that simple , if we could just follow certain rules and flight safety was achieved 100% of the time then we would have been doing it for decades. There is an undeniable element of uncertanty and change in any approach and if the pilot is experienced and proficient they can normally absorb these variables without too much planning or conscious thought by simply reacting.
I agree that 'captains discretion has killed more people than going around from an unstable approach' but in all the flight-deck transcripts I have read over the years I think I have only ever seen one that had something that could be loosly translated as "I can make this...lets give it a go"...in fact none resembled "lets give it a go", one is similar to "I can make this".
Cheers