Why is ultralight touring so unpopular?
Without defining where you are riding, at what time of year, and for how long, comparing different loads is pretty meaningless.
UL touring in pleasant summer weather in the USA is somewhat different than a multi-year 4-season round the world tour, neh?
Personally I love riding however light or heavy my load is. I've never toured with as much gear as Göran Kropp did on his way from Sweden to Everest, but I'm sure I'd enjoy that too!