I use a lot of flannel in fall and winter, and I've used past year's issue of "Woolies". I never prewash precuts, including flannel. I do prewash flannel yard goods, particularly bright or dark colors. Everything I've been taught or read recommends 1/2" seam allowance for flannel, so I always do this. I also use my walking foot, even for piecing on flannel. I try not to use hot water, or the hottest dryer, just warm. Also watch the agitation in the washer: it's the agitation that tears them up. I usually use a delicate cycle, more soak and less agitation. I also tend to use big squares, etc rather than small pieces, but of course this is a personal choice. Mine have held up fine with hard use. I have on rare occasions had to repair a seam after washing, that was always a place where my seam allowance got a little wonky! Please don't give up on flannel, it just takes a slight amount of adjusting.