I've 'required' the ILS on many a CAVOK day in Sydney when everyone else were accepting visual approaches. 99% of the time it was due to tiredness. Yes, it upset ATC and yes it pi#$ed off other pilots but do I care....nope. For reasons on the day, I decided it was the safest course of action. Not efficient for my company or ATC but at the end of the day as PIC I only have three parties that I have to satisfy 100% of the time.....CASA, my crew and the 180 pax down the back. Keeping the company and ATC happy come last.
This same argument applies to requiring the longer runway.
Thats my view anyway.