Personally, I love that there are different versions of white (assuming they are appropriately named). I love using "white" for the background of my quilts. I just think it is so incredibly beautiful & really displays the colors in my quilt nicely. But when I use more saturated colors, I like using a brighter white. When I use more muted/dusty colors, I prefer a warmer, creamier white like Moda's snow. And of course even more fun than both of those are white on white prints. Too much fun! I actually had a friend challenge me to make a "tone-on-tone" all white quilt. I might make one in miniature for her some day in my free time (ha! free time.), but meanwhile I will continue appreciating how different whites interact with the other colors in my quilt. The only issue is when I fail to buy sufficient fabric on my first shop. The variations from bolt to bolt of the exact same fabric (in white or any color) can be beyond maddening.
The same seems to hold true for black. I can pick a black that is more grey for muddy boots or one that has hints of other colors for an appliqued dress. I hadn't heard of the Amish Black fabric, but I really like the idea. I may have to try that in a future quilt. It sounds intriguing.