to be fair though... three season hanging you can probably do with one quilt. Winter hanging you need more insulation and ground dwellers often have multiple sleep pads depending on the temps. Lots of people have multiple sleeping bags for different temps. So the multiple items thing is not limited to hammocks.
I may be slow... But I sure am gimpy.
"Bless you child, when you set out to thread a needle don't hold the thread still and fetch the needle up to it; hold the needle still and poke the thread at it; that's the way a woman most always does, but a man always does t'other way."
Mrs. Loftus to Huck Finn
We Don't Sew... We Make Gear! video series
Important thread injector guidelines especially for Newbies
Bobbin Tension - A Personal Viewpoint
when i want to push my UQ below 25°, i combine it with a ccf pad. i have found, the UQ works great in temps from 70 down to <30°
the beauty of my hiking terrain is that i can find a moderate temp range with very little fluctuation all times of year (40 for a low can be found all 4 seasons, hiking range from 1200' to 12,000')
id like to make a winter down UQ but that's just not really necessary, for my terrain. If temps get down into the 10's or below, im staying home!
I agree, my 3-season underquilts will cover the bulk of my camping and most all of my hiking. I do use a winter underquilt when it gets in the single digits. I could use pads to supplement, but it's just a lot easier, warmer, and pack-friendly to switch out quilts.
I use just the one UQ, a winter yeti. It has worked fine through the summer and obviously all winter. But to be completely fair to the question the temps where I am are moderate. never too hot (88ish) nor too cold (10ish). And the 88ish is during the day, and is a fair bit cooler at night. at 88ish Islide it off to the side and just pull it back in place when needed.
I thought I was wrong once, turns out I was wrong about that.