1.the empty pockets are all i needed for insulation for the first three summers (50 degf)that i had the clark na.last summer,the fourth,i found this forum and read about cold but syndrom.now that i know i have something to worry about i allways make sure i have the pockets as full as posible.i only got cold 3 times those first three years,all three times overnights went to 32 deg unexpectadly.guessing about 45 summertime hangs in that time with little more then a t shirt and a pair of pants ect in the pockets.
2 not sure what you meen.the seems themself do not create cold spots,nor do they add warmth.
3.this is true if you are any kind of lightweight consciense backpacker.if you use down pillows it is possible.winter sled camping is totally doable.the clark is my go to winter hammock.of course i do not yet have any other uq's suitable for winter yet.i backpacked with mine a few times last summer.on warm nights i do not worry i use spare cloths,stuff sacks,ect.if it is going to get cold i use bags of leaves,cattail down marsh grass ect.to suplement my other stuff.
4.i have never used one with my clark.have slept to -18degf.
most people like to use uqs.so they must work good.i would not get a clark if i used an uq.
5.i tried a pad one time did not like it.would work for summer insulation.again never had much problem with cold spots.
if i was offered a choice of a clark or a warbonet hammocks(or any other single or double layer uninsulated hammock ) to sleep in one night,and no other under insulation was offered,i would take the clark no hesitation.the dead air space created by the pockets does make a differance.it keeps the breeze that is constantly blowing the heat of your back,from getting to your back.