i don't know where you came up with that assumption???
around here i see lots and lots of yellow...
and in our little sewing/quilting group we have one lady who has been actively quilting for over 50 years---according to her- it's not a quilt if it doesn't have at least a piece of yellow somewhere---she really loves yellow in quilts- and makes FABULOUS ONES!
so...
maybe in your neighborhood they do not use yellow???
typed yellow quilts into the search engine- over a hundred pages to look at....
personally- not a yellow person- but have included yellows when they were needed- i'm not quite convinced that every quilt should have a little yellow :)