I'm with the no pre-wash girls.
I've been doing laundry for about 40 years, give or take a couple. Fabric is fabric and in those 40 years I've had exactly *1* thing pick up a color bleed and it not wash out. And I did that *with* bleach. After getting color catchers I discovered lots and lots of fabrics bleed forever, no matter how many times they've been washed and dried.
Batting controls the fabric shrinkage in quilts. If you don't want shrinkage then either use poly batting or a cotton batting that can be pre-shrunk. For that matter I've even mixed pre-washed and not pre-washed in the same quilt and it was totally fine. You couldn't tell which was which after the quilt was finished and washed.
Pre-washing fabric is an entirely different issue if you're allergic to the finishing chemicals.
I don't want to spend my time washing and ironing fabric. I'd rather just sew.