I can see the attraction of a light item, but my doubt is that I am not sure how warm you are in a quilt that does not encase your upper body/head firmly?
I have a Neutrino 200 (625gr) and fully enjoy the double string closure at the top, one above shoulders and one around face. It is warm for a really cold wimp like me in a tent down to 5-7 degrees (and I wear clothes inside it, and have been "OK" but quite cold sleeping in a bivvy (Alpkit Hunka) of on exposed hill side with 15mph wind @ 8-10 degrees (can't calculate chill factor but it was on my limit of "right time to get up and march off to warm up)
I have not yet understood why a quilt would be better unless it is very warm (then surely something lighter and smaller can be substituted) or it would be so much lighter (at least 200 gr) to make it worth the suffering for someone obviously tougher than me.
So would really be keen to understand the advantages, in case I am missing out something
(a constant fear of an insecure camper LOL!)