I use Warm and White batting. I do preshrink it. It washes beautifully if you don't agitate. I soak it for an hour or so in very warm water. I spin out the water. Then it does into the dryer on gentle. I've never had a problem with it falling apart. I do longarm quilting. I don't want my finished quilts to shrink. All fabrics get a prewash, too. Fabrics can bleed, especially batiks. I press them using Mary Ellen to get the crispness back prior to cutting.
Any batting with cotton will shrink. I've not tried wool. I imagine there is shrinkage with it too.
Cynthia