The Quilting loops keep the quilt stablized when you pull the quilt out of your pack and it's stuff sack.
If you stuff it loose in a, trash bag or similar, and pull the sack out of the pack instead of the quilt, you can greatly minimize the need for loops with the newer XP insulations.
If you're rough on gear .... the use the quilting loops.
If you're the type of hiker that has his first potty trowl shined to a high gloss, then skip the loops. (only hand wash and hang dry if you don't have loops) The synthetic insulation will degrade and begin to lose some of it's ability to insulate in about a 100 to 150 bag nights typically, unless you're really, really, really careful with it.
Me .... I just make a new one every two years and forget it .... The technology cycle on new synthetic insulations is about every 2 years anyway, and since I don't wash em, they start to stink, so it works out well for me.
I take the old quilts and use em on the couch in the winter, or cut em up for prototypes of new quilt designs and then toss em out.