The only time it should stop you from putting certain fabrics together--Fassett's or otherwise -- is if YOU gasp in horror. Or the person you're giving it to. I love Kaffe's bold, bright, unique style fabrics, and have sloooowly been starting to collect a few, but when I browse Pinterest for Kaffe quilts, the ones that appeal to me have some solids and prints of low volume from other lines. His are almost all florals and swirls or geometrics, if I'm not mistaken. I personally can't handle that much color and noise. It's like walking into Chuck E. Cheese for a 4 year old's birthday party.
Now, we could all join forces and play a joke to mess with you, put on our Quilt Police uniforms, and collectively gasp in horror when you post your quilt, but we won't. We are cheerleaders and we don't wear badges. If you're happy with your fabrics, that's all that matters.