I use wide backing fabrics for my binding all the time. I always use wide backing and I’ve never had one that was a lesser quality compared to 40” wide fabric. I have had pieced bindings wear out and need to be replaced- which i replaced with binding that didn’t need to be pieced. I’ve never heard of anyone having problems with wide backing fabric for binding- it would be the same as cutting your binding from the length of yardage instead of from the width- which I’ve also done