Google MODERN HOMES and look at the photos for a little. I think 'modern' quilts are similar to 'modern' homes.
Modern Quilts seem
geometric,
simple or basic shapes with lots of 'open space' that allow the
quilting to be an important design element in the MQ look.
In modern quilts, I see
fabrics by NEW designers in UNIQUE colors that are on a
new ring outside the basic color wheel. As some pointed out above, the color choices MQers chose may not be what a 'traditional quilter' would use. But you don't mix ERAs, do you? I don't think you'll see Civil War era or 30's fabrics in truly MQ....but you wouldn't mix different eras together in traditional quilting unless you were doing scrappy.
While it appears there are lots of 'young' quilters involved in MQ, some of us traditional quilters are joining them!

It's NEW! It's EXCITING! It's HISTORICAL! and I LOVE IT!
A quilt is a quilt is a quilt - LOVE IT - USE IT - ADMIRE IT.
Everyone's TASTE is different. Just like there's different styles of houses and cookies, there's different styles of quilts.
Nan - in snowy Indiana