Not wanting to start an argument, but I really think the use of big, efficient, pulleys is highly beneficial. Ditto a thin static cord when applying a 2:1.
As some else said, for Brits bailing is best avoided because of the investment put in, both in terms of money and time. So it really helps if the whole thing is a pleasant experience when the unplanned happens - like being delayed by people of storm. I also think the approach for the strong and tough is likely to be different than for the weak, light and old (like me). This comes across in Chris Mac's book where he very much points at 1:1 and a light is right approach. For me, I like the vertical camping and the aid climbing of El Cap - I can go light, fast and free in other places: I have just fitted by ledge with fairy lights and a blue tooth speaker.
I have hauled the nose with a guy much bigger than me. We space hauled as a pair to sickle, then he used 1:1 and I used 2:1 until the last day, when 1:1 was easy for me too. I never over strained; I'm would guess it felt like a steep hill climb on a bike level of work. I haven't measured it, but I would say a 2:1 congo is about as gentle on the body as a 3:1 using the rope, but your body moves a less far as it is 2:1, so I guess less overall effort.
If anyone has the kit at a sports science dept, I would love to measure work output for a human hauling through different systems - there must be an MSc or UG dissertation in that.