wool batting adds loft and fluffiness-without weight.
double batt would be very difficult to hand quilt.
back in the day= the small squares with all the seams added weight- many small blocks were created on a muslin foundation- an extra layer of weight- old wool or cotton blankets were re-purposed as batts...that is really where all that weight came from- if you want a really weighty quilt a flannel/denim one will give you the heft you desire- using a blanket in place of a batt- and using foundations...all add the extra weight