I have not been using any whites lately. I hate the seams showing like they did in your quilt. I hold any white fabric I am thinking about buying up and if I can see through it, I won't buy it. It has to be thick for me to even want it in my sewing room. It really limits me to darker colors, but I like them, so there you have it.
Edited to Add: Just read the notes about the interfacing on all the white pieces. I'm not sure if I want to try to use an interfacing with all the white. It seems like a lot of extra work to me. I am a lazy quilter. lol