There are some Poly and blends that will beard and/or pill. I don't as a general rule use blends but don't have a rule against it, infact there are times when a blend will outperform a 100 percent cotton. Absolute black is one of those times. A 100 percent cotton black fabric will loose color faster than a blend, in side by side wash per wash testing. I have done my own testing with swatches from different companies ...different lines.. throwing the swatches into the same laundry loads every time ...... and yep a blend beats it( 100 percent cotton) hands down in the which black will stay black longer test.
Quilts were orginally made from what was on -hand.... I follow that lead ...