Part of the irony of some of the stops of the days of old was that, on some of them, disembarkation was not required (or didn't happen). I thought I remember taking a TPAC flight on QF one time and we made a stop in NAN, before reaching HNL (before then going onto SFO). I can't remember it specifically being a stop for fuel (but then again I was 10 years old then), but I remember that we didn't disembark.
As the Kangaroo route became a smattering of stops to a few to just one, I wonder how that was accepted by the general public.
Granted, seats were rather comfortable (relatively speaking) then - it's nowhere near a culture of flat bed seats in J or F, of course; makes us today seem rather "soft" compared to those flying then. But they were shorter flights, and then people had to contend that those flights were going to get longer.... much longer.
The extra space is good (in theory), but I think a key element here will be definitely people have to get up and move around and so on, and not just for using the toilet. That's going to take some getting used to as a passenger, and then some for the crew to manage everyone on the aircraft doing it.
I've flown SQ SIN-EWR (this was ages ago when it was operated by a A345), clocking in a flight time of just shy of 19 hours. That was an exhausting flight (in J), so it will be interesting to see if QF's tricks to promote wellbeing will ease things up just a tad or better on a flight a few more hours than that. (Suffice to say, I wonder how well people feel after taking SQ SIN-NYC flights these days, operated with something much more modern than a A345 sporting that not world leading comfortable J seat)