I have an anxiety related illness
choosing my own fabrics for a block is often enough to put me in bed for a week....not good when I'm supposed to be the designated quilter in a weekly craft group
a BOM means that I get a little fabric each month, for a set cost
it usually has a color picture, so I don't have to worry where each piece goes
a bit like color-by-numbers, but sometimes, that's all I can do