As for visuals vs instruments to maximize runway capacity, it's a furphy, look at the worlds busiest high capacity aerodromes, very few 'visuals' and they still get the job done without missing slots.
300kgs and 3 mins per approach is no furphy, it is a waste of money and of resource. Quite frankly, if I was in charge of fuel saving in my company, I wouldn't be worried so much about the APU fuel savings and more worried about this BS! I'll say it another way so you can maybe see my point. If you had feeder points at 3000' at 10 miles to run even as generic visual approach points. The aircraft can fly them at a nice 3 degree slope much like an ILS without having to be aligned 10 freaking miles out and wasting so much gas. I understand as ATCers you still have to get A/C slotted in the correct sequence. That wouldn't change. There is however, no need to have an ILS done in VMC to accomplish this.
