Probably the most notable for me is the "100% Cotton" idea. The quilts I have from my Grandma are wool or poly blends, or what ever she had on hand. The ones I made for my kids when they were at home were made from remnants from a drapery shop- no idea what the content was, but I prewashed them and it was fine. I made other quilts and used what fabric I liked, including plush and sateen.
And why is that "bias" seems to be a dirty word now days?
And the whole "press not iron" debate, another thing I never encountered when making quilts 30 years ago.