It is a legitimate question. I have never heard of any kind of can of worms about this; i just did not know that people washed quilts in hot water. Most people I know advise washing them in warm or cool and on a gentle cycle if they have that option. But many people asked this beside me and I wonder why I am being a bit singled out here.
I have heard that if you buy your fabric at Joanne's that it is made with a lower thread count than other lines. I do not know this for a fact, but have been told this by several people. This could mean a weaker fabric in general.