Of the many issues arising here, as a frequently paying passenger, I find that the idea that one of the two pilots on board may be viewed (by his own captain) as being incapable of being left on his own by virtue of his inexperience and inability to be profoundly shocking.
That a sane Captain could profess to preferring to soil himself than to leave an inexperienced first officer alone at the controls is mind-boggling.
With a two-pilot cockpit, surely pax have the right to expect that in the event of a pilot incapacitation, the remaining pilot (whether captain or F/O) will be fully and entirely qualified and capable of safely and competently completing the flight, regardless of weather conditions, and indeed that he would be capable of dealing with any emergency or hazard.
If that is not the case, then surely we have to reintroduce a three pilot cockpit at least every time there is a 'second dickie' with less than a particular level of experience/skill/capability?
And perhaps junior, inexperienced first officers should also only fly within a constituted crew, in which two more experienced pilots would get to know him or her better, and be able to start to form an impression of both skills and psyche?
As an aside, if members feel that postings by non pilots get in the way, or are not worth reading, then perhaps one solution would be for posts by vetted members who can prove themselves to be qualified to whatever level were deemed appropriate to automatically appear in bold, with a particular background colour, to allow the less patient to skim through what they might view as dross, and read only the posts by professional pilots.